Step-by-step Maths Level 3 Counting to 1000: check-up and practice test questions

Method. Change only the hundreds digit when we go more than the number.

1. Start at 645. We begin with this number.
   645
2. Change the hundreds digit. Only the hundreds digit changes. The others stay the same.
   645 + 100 = 745
3. Write the answer. This is the new number.
   745

Check. 100 less than 745 is 645. It works.

Watch out. Only the hundreds digit changes. Keep the other digits the same.

Method. Start at the number and count on or back, one number at a time.

1. Start at 255. We begin with this number.
   255
2. Count on 8. Say each new number as we go.
   255 + 8 = 263
3. Write the answer. This is the last number we reached.
   263

Check. Count back 8 from 263: you reach 255.

Watch out. Start from the number in the question. Do not start again from 1 or from 0.

Method. Start at the number and count on or back, one number at a time.

1. Start at 156. We begin with this number.
   156
2. Count on 6. Say each new number as we go.
   156 + 6 = 162
3. Write the answer. This is the last number we reached.
   162

Check. Count back 6 from 162: you reach 156.

Watch out. Start from the number in the question. Do not start again from 1 or from 0.

Method. Count on in fifties by adding or taking away 50 each time.

1. Start at 50. We count from this number.
   50
2. Add 50 each time. We count on in fifties.
   50 + 50 = 100; 100 + 50 = 150
3. Write the numbers in order. These are the next numbers we said.
   100, 150, 200

Check. Count back in fifties from 200 to check. You reach 50.

Watch out. The step is 50. Each new number is 50 more than the last.

Method. Start at the number and count on or back, one number at a time.

1. Start at 391. We begin with this number.
   391
2. Count back 11. Say each number as we pass it.
   391 - 11 = 380
3. Write the answer. This is the last number we reached.
   380

Check. Count on 11 from 380: you reach 391.

Watch out. Start from the number in the question. Do not start again from 1 or from 0.

Method. Count back in hundreds by adding or taking away 100 each time.

1. Start at 900. We count from this number.
   900
2. Take 100 each time. We count back in hundreds.
   900 - 100 = 800; 800 - 100 = 700
3. Write the numbers in order. These are the next numbers we said.
   800, 700, 600

Check. Count on in hundreds from 600 to check. You reach 900.

Watch out. The step is 100. Each new number is 100 less than the last.

Method. Start at the number and count on or back, one number at a time.

1. Start at 648. We begin with this number.
   648
2. Count on 6. Say each new number as we go.
   648 + 6 = 654
3. Write the answer. This is the last number we reached.
   654

Check. Count back 6 from 654: you reach 648.

Watch out. Start from the number in the question. Do not start again from 1 or from 0.

Method. Count on in tens by adding or taking away 10 each time.

1. Start at 960. We count from this number.
   960
2. Add 10 each time. We count on in tens.
   960 + 10 = 970; 970 + 10 = 980
3. Write the numbers in order. These are the next numbers we said.
   970, 980, 990

Check. Count back in tens from 990 to check. You reach 960.

Watch out. The step is 10. Each new number is 10 more than the last.

Method. Count on in fives by adding or taking away 5 each time.

1. Start at 238. We count from this number.
   238
2. Add 5 each time. We count on in fives.
   238 + 5 = 243; 243 + 5 = 248
3. Write the numbers in order. These are the next numbers we said.
   243, 248, 253

Check. Count back in fives from 253 to check. You reach 238.

Watch out. The step is 5. Each new number is 5 more than the last.

Method. Change only the hundreds digit when we go less than the number.

1. Start at 390. We begin with this number.
   390
2. Change the hundreds digit. Only the hundreds digit changes. The others stay the same.
   390 - 100 = 290
3. Write the answer. This is the new number.
   290

Check. 100 more than 290 is 390. It works.

Watch out. Only the hundreds digit changes. Keep the other digits the same.

Method. Count back in tens by adding or taking away 10 each time.

1. Start at 800. We count from this number.
   800
2. Take 10 each time. We count back in tens.
   800 - 10 = 790; 790 - 10 = 780
3. Write the numbers in order. These are the next numbers we said.
   790, 780, 770

Check. Count on in tens from 770 to check. You reach 800.

Watch out. The step is 10. Each new number is 10 less than the last.

Method. Start at the number and count on or back, one number at a time.

1. Start at 759. We begin with this number.
   759
2. Count on 4. Say each new number as we go.
   759 + 4 = 763
3. Write the answer. This is the last number we reached.
   763

Check. Count back 4 from 763: you reach 759.

Watch out. Start from the number in the question. Do not start again from 1 or from 0.

Method. Start at the number and count on or back, one number at a time.

1. Start at 82. We begin with this number.
   82
2. Count on 10. Say each new number as we go.
   82 + 10 = 92
3. Write the answer. This is the last number we reached.
   92

Check. Count back 10 from 92: you reach 82.

Watch out. Start from the number in the question. Do not start again from 1 or from 0.

Method. Count on in twos by adding or taking away 2 each time.

1. Start at 36. We count from this number.
   36
2. Add 2 each time. We count on in twos.
   36 + 2 = 38; 38 + 2 = 40
3. Write the numbers in order. These are the next numbers we said.
   38, 40, 42

Check. Count back in twos from 42 to check. You reach 36.

Watch out. The step is 2. Each new number is 2 more than the last.

Method. Count on in fives by adding or taking away 5 each time.

1. Start at 84. We count from this number.
   84
2. Add 5 each time. We count on in fives.
   84 + 5 = 89; 89 + 5 = 94
3. Write the numbers in order. These are the next numbers we said.
   89, 94, 99

Check. Count back in fives from 99 to check. You reach 84.

Watch out. The step is 5. Each new number is 5 more than the last.

Method. Change only the hundreds digit when we go less than the number.

1. Start at 661. We begin with this number.
   661
2. Change the hundreds digit. Only the hundreds digit changes. The others stay the same.
   661 - 100 = 561
3. Write the answer. This is the new number.
   561

Check. 100 more than 561 is 661. It works.

Watch out. Only the hundreds digit changes. Keep the other digits the same.

Method. Change only the tens digit when we go less than the number.

1. Start at 774. We begin with this number.
   774
2. Change the tens digit. Only the tens digit changes. The others stay the same.
   774 - 10 = 764
3. Write the answer. This is the new number.
   764

Check. 10 more than 764 is 774. It works.

Watch out. Only the tens digit changes. Keep the other digits the same.

Method. Start at the number and count on or back, one number at a time.

1. Start at 249. We begin with this number.
   249
2. Count on 5. Say each new number as we go.
   249 + 5 = 254
3. Write the answer. This is the last number we reached.
   254

Check. Count back 5 from 254: you reach 249.

Watch out. Start from the number in the question. Do not start again from 1 or from 0.

Method. Start at the number and count on or back, one number at a time.

1. Start at 774. We begin with this number.
   774
2. Count back 3. Say each number as we pass it.
   774 - 3 = 771
3. Write the answer. This is the last number we reached.
   771

Check. Count on 3 from 771: you reach 774.

Watch out. Start from the number in the question. Do not start again from 1 or from 0.

Method. Count back in tens by adding or taking away 10 each time.

1. Start at 170. We count from this number.
   170
2. Take 10 each time. We count back in tens.
   170 - 10 = 160; 160 - 10 = 150
3. Write the numbers in order. These are the next numbers we said.
   160, 150, 140

Check. Count on in tens from 140 to check. You reach 170.

Watch out. The step is 10. Each new number is 10 less than the last.