Step-by-step Maths Level 4: Rounding to the nearest 10
Part of the Step-by-step Maths Level 4 comparing, ordering and rounding chapter. Chapter overview · whole chapter on one page
Rounding to the nearest 10
To round to the nearest 10, look at the ones digit. Five or more rounds up to the next ten. Less than five rounds down.
Example: 4836 rounds up to 4840, because the ones digit 6 is 5 or more.
Key ideas
- Look at the ones digit.
- 5 or more: round up. Less than 5: round down.
- The ones become 0 after rounding.
Method. Round to the nearest 10: look at the ones digit.
- Look at the ones digit. The ones digit tells us which ten it is nearer to.the ones digit is 6
- Decide: five or more. Six is five or more, so round up.6 is at least 5
- Round up to the next ten. Keep the same tens and add one more ten.4830 + 10 = 4840
- Write the answer. This is the nearest multiple of 10.4840
Check. Check: 4840 is a multiple of 10 and is 4 away from 4836.
Watch out. Exactly 5 rounds up.
Method. Round to the nearest 10: look at the digits to the right of the ten place.
- Look at the ones digit. The digits on the right tell us which way to go.the ones digit is 3
- Decide: less than 5. Half of 10 is 5. 5 or more rounds up; less than 5 rounds down.3 is less than 5
- Round down. Keep the same tens, and the digits to the right become 0.7523 rounds down to 7520
- Write the answer. This is the nearest multiple.7520
Check. Check: 7520 is a multiple of 10, and it is the closest one to 7523.
Watch out. Exactly 5 rounds up. Do not change the digits to the left of the place you round to, except when a carry is needed.
Method. Round to the nearest 10: look at the digits to the right of the ten place.
- Look at the ones digit. The digits on the right tell us which way to go.the ones digit is 5
- Decide: 5 or more. Half of 10 is 5. 5 or more rounds up; less than 5 rounds down.5 is at least 5
- Round up. Add one more ten, and the digits to the right become 0.9995 rounds up to 10000
- Write the answer. This is the nearest multiple.10000
Check. Check: 10000 is a multiple of 10, and it is the closest one to 9995.
Watch out. Exactly 5 rounds up. Do not change the digits to the left of the place you round to, except when a carry is needed.
Watch out
Watch out. 9995 rounds up to 10000, because 5 is five or more. Rounding can change the thousands digit.
Exam tip
Grown-up tip. Ask: “Is the ones digit five or more?” before the child writes the answer.
Exercise 2D Practice: rounding to 10
Non-calculatorMethod. Round to the nearest 10: look at the digits to the right of the ten place.
- Look at the ones digit. The digits on the right tell us which way to go.the ones digit is 6
- Decide: 5 or more. Half of 10 is 5. 5 or more rounds up; less than 5 rounds down.6 is at least 5
- Round up. Add one more ten, and the digits to the right become 0.3896 rounds up to 3900
- Write the answer. This is the nearest multiple.3900
Check. Check: 3900 is a multiple of 10, and it is the closest one to 3896.
Watch out. Exactly 5 rounds up. Do not change the digits to the left of the place you round to, except when a carry is needed.
Method. Round to the nearest 10: look at the digits to the right of the ten place.
- Look at the ones digit. The digits on the right tell us which way to go.the ones digit is 7
- Decide: 5 or more. Half of 10 is 5. 5 or more rounds up; less than 5 rounds down.7 is at least 5
- Round up. Add one more ten, and the digits to the right become 0.9747 rounds up to 9750
- Write the answer. This is the nearest multiple.9750
Check. Check: 9750 is a multiple of 10, and it is the closest one to 9747.
Watch out. Exactly 5 rounds up. Do not change the digits to the left of the place you round to, except when a carry is needed.
Method. Round to the nearest 10: look at the digits to the right of the ten place.
- Look at the ones digit. The digits on the right tell us which way to go.the ones digit is 1
- Decide: less than 5. Half of 10 is 5. 5 or more rounds up; less than 5 rounds down.1 is less than 5
- Round down. Keep the same tens, and the digits to the right become 0.4381 rounds down to 4380
- Write the answer. This is the nearest multiple.4380
Check. Check: 4380 is a multiple of 10, and it is the closest one to 4381.
Watch out. Exactly 5 rounds up. Do not change the digits to the left of the place you round to, except when a carry is needed.
Method. Round to the nearest 10: look at the digits to the right of the ten place.
- Look at the ones digit. The digits on the right tell us which way to go.the ones digit is 8
- Decide: 5 or more. Half of 10 is 5. 5 or more rounds up; less than 5 rounds down.8 is at least 5
- Round up. Add one more ten, and the digits to the right become 0.5958 rounds up to 5960
- Write the answer. This is the nearest multiple.5960
Check. Check: 5960 is a multiple of 10, and it is the closest one to 5958.
Watch out. Exactly 5 rounds up. Do not change the digits to the left of the place you round to, except when a carry is needed.
Method. Round to the nearest 10: look at the digits to the right of the ten place.
- Look at the ones digit. The digits on the right tell us which way to go.the ones digit is 4
- Decide: less than 5. Half of 10 is 5. 5 or more rounds up; less than 5 rounds down.4 is less than 5
- Round down. Keep the same tens, and the digits to the right become 0.1894 rounds down to 1890
- Write the answer. This is the nearest multiple.1890
Check. Check: 1890 is a multiple of 10, and it is the closest one to 1894.
Watch out. Exactly 5 rounds up. Do not change the digits to the left of the place you round to, except when a carry is needed.
Method. Round to the nearest 10: look at the digits to the right of the ten place.
- Look at the ones digit. The digits on the right tell us which way to go.the ones digit is 6
- Decide: 5 or more. Half of 10 is 5. 5 or more rounds up; less than 5 rounds down.6 is at least 5
- Round up. Add one more ten, and the digits to the right become 0.5276 rounds up to 5280
- Write the answer. This is the nearest multiple.5280
Check. Check: 5280 is a multiple of 10, and it is the closest one to 5276.
Watch out. Exactly 5 rounds up. Do not change the digits to the left of the place you round to, except when a carry is needed.
Method. Round to the nearest 10: look at the digits to the right of the ten place.
- Look at the ones digit. The digits on the right tell us which way to go.the ones digit is 9
- Decide: 5 or more. Half of 10 is 5. 5 or more rounds up; less than 5 rounds down.9 is at least 5
- Round up. Add one more ten, and the digits to the right become 0.3109 rounds up to 3110
- Write the answer. This is the nearest multiple.3110
Check. Check: 3110 is a multiple of 10, and it is the closest one to 3109.
Watch out. Exactly 5 rounds up. Do not change the digits to the left of the place you round to, except when a carry is needed.
Method. Round to the nearest 10: look at the digits to the right of the ten place.
- Look at the ones digit. The digits on the right tell us which way to go.the ones digit is 5
- Decide: 5 or more. Half of 10 is 5. 5 or more rounds up; less than 5 rounds down.5 is at least 5
- Round up. Add one more ten, and the digits to the right become 0.9105 rounds up to 9110
- Write the answer. This is the nearest multiple.9110
Check. Check: 9110 is a multiple of 10, and it is the closest one to 9105.
Watch out. Exactly 5 rounds up. Do not change the digits to the left of the place you round to, except when a carry is needed.
Method. Round to the nearest 10: look at the digits to the right of the ten place.
- Look at the ones digit. The digits on the right tell us which way to go.the ones digit is 8
- Decide: 5 or more. Half of 10 is 5. 5 or more rounds up; less than 5 rounds down.8 is at least 5
- Round up. Add one more ten, and the digits to the right become 0.6498 rounds up to 6500
- Write the answer. This is the nearest multiple.6500
Check. Check: 6500 is a multiple of 10, and it is the closest one to 6498.
Watch out. Exactly 5 rounds up. Do not change the digits to the left of the place you round to, except when a carry is needed.
Method. Round to the nearest 10: look at the digits to the right of the ten place.
- Look at the ones digit. The digits on the right tell us which way to go.the ones digit is 5
- Decide: 5 or more. Half of 10 is 5. 5 or more rounds up; less than 5 rounds down.5 is at least 5
- Round up. Add one more ten, and the digits to the right become 0.8185 rounds up to 8190
- Write the answer. This is the nearest multiple.8190
Check. Check: 8190 is a multiple of 10, and it is the closest one to 8185.
Watch out. Exactly 5 rounds up. Do not change the digits to the left of the place you round to, except when a carry is needed.
Method. Round to the nearest 10: look at the digits to the right of the ten place.
- Look at the ones digit. The digits on the right tell us which way to go.the ones digit is 0
- Decide: less than 5. Half of 10 is 5. 5 or more rounds up; less than 5 rounds down.0 is less than 5
- Round down. Keep the same tens, and the digits to the right become 0.9240 rounds down to 9240
- Write the answer. This is the nearest multiple.9240
Check. Check: 9240 is a multiple of 10, and it is the closest one to 9240.
Watch out. Exactly 5 rounds up. Do not change the digits to the left of the place you round to, except when a carry is needed.
Method. Round to the nearest 10: look at the digits to the right of the ten place.
- Look at the ones digit. The digits on the right tell us which way to go.the ones digit is 2
- Decide: less than 5. Half of 10 is 5. 5 or more rounds up; less than 5 rounds down.2 is less than 5
- Round down. Keep the same tens, and the digits to the right become 0.8672 rounds down to 8670
- Write the answer. This is the nearest multiple.8670
Check. Check: 8670 is a multiple of 10, and it is the closest one to 8672.
Watch out. Exactly 5 rounds up. Do not change the digits to the left of the place you round to, except when a carry is needed.
Method. Round to the nearest 10: look at the digits to the right of the ten place.
- Look at the ones digit. The digits on the right tell us which way to go.the ones digit is 9
- Decide: 5 or more. Half of 10 is 5. 5 or more rounds up; less than 5 rounds down.9 is at least 5
- Round up. Add one more ten, and the digits to the right become 0.8529 rounds up to 8530
- Write the answer. This is the nearest multiple.8530
Check. Check: 8530 is a multiple of 10, and it is the closest one to 8529.
Watch out. Exactly 5 rounds up. Do not change the digits to the left of the place you round to, except when a carry is needed.
Method. Round to the nearest 10: look at the digits to the right of the ten place.
- Look at the ones digit. The digits on the right tell us which way to go.the ones digit is 0
- Decide: less than 5. Half of 10 is 5. 5 or more rounds up; less than 5 rounds down.0 is less than 5
- Round down. Keep the same tens, and the digits to the right become 0.6900 rounds down to 6900
- Write the answer. This is the nearest multiple.6900
Check. Check: 6900 is a multiple of 10, and it is the closest one to 6900.
Watch out. Exactly 5 rounds up. Do not change the digits to the left of the place you round to, except when a carry is needed.
Method. Round to the nearest 10: look at the digits to the right of the ten place.
- Look at the ones digit. The digits on the right tell us which way to go.the ones digit is 7
- Decide: 5 or more. Half of 10 is 5. 5 or more rounds up; less than 5 rounds down.7 is at least 5
- Round up. Add one more ten, and the digits to the right become 0.7117 rounds up to 7120
- Write the answer. This is the nearest multiple.7120
Check. Check: 7120 is a multiple of 10, and it is the closest one to 7117.
Watch out. Exactly 5 rounds up. Do not change the digits to the left of the place you round to, except when a carry is needed.
Method. Round to the nearest 10: look at the digits to the right of the ten place.
- Look at the ones digit. The digits on the right tell us which way to go.the ones digit is 7
- Decide: 5 or more. Half of 10 is 5. 5 or more rounds up; less than 5 rounds down.7 is at least 5
- Round up. Add one more ten, and the digits to the right become 0.4547 rounds up to 4550
- Write the answer. This is the nearest multiple.4550
Check. Check: 4550 is a multiple of 10, and it is the closest one to 4547.
Watch out. Exactly 5 rounds up. Do not change the digits to the left of the place you round to, except when a carry is needed.