Reception Maths: Doubles
Part of the Reception Maths making and splitting numbers chapter. Chapter overview · whole chapter on one page
Doubles
Leo has two rows of cubes. Both rows are the same. He has the same number in each row.
A double is when you add a number to itself. Two 3s make 6: 3 + 3 = 6.
Key ideas
- A double is a number added to itself.
- Two equal rows make a double.
- Doubles are easy to check by counting both rows.
Key words. A double is two of the same number.
Method. A double is two equal parts. Add the number to itself.
- Find the two equal rows of 3. The two rows are the same length.3 and 3
- Count the total. Count both rows together.3 + 3 = 6
- Write the answer. 6
Check. Count on from 3 another 3: the answer is 6. ✓
Watch out. Doubles have two equal parts. Check that both rows match.
Key words. A double is two of the same number.
Method. A double is two equal parts. Add the number to itself.
- Find the two equal rows of 4. The two rows are the same length.4 and 4
- Count the total. Count both rows together.4 + 4 = 8
- Write the answer. 8
Check. Count on from 4 another 4: the answer is 8. ✓
Watch out. Doubles have two equal parts. Check that both rows match.
Key words. A double is two of the same number.
Method. A double is two equal parts. Add the number to itself.
- Find the two equal rows of 5. The two rows are the same length.5 and 5
- Count the total. Count both rows together.5 + 5 = 10
- Write the answer. 10
Check. Count on from 5 another 5: the answer is 10. ✓
Watch out. Doubles have two equal parts. Check that both rows match.
Watch out
Watch out: 2 + 2 is a double, but 2 + 3 is not. A double has two equal parts.
Exam tip
Grown-up tip. Put two equal rows of buttons on a table. Ask: “Are the rows the same?” Count both rows, then count again with the rows the other way round.
Exercise 4D Doubles
Non-calculatorKey words. A double is two of the same number.
Method. A double is two equal parts. Add the number to itself.
- Find the two equal rows of 1. The two rows are the same length.1 and 1
- Count the total. Count both rows together.1 + 1 = 2
- Write the answer. 2
Check. Count on from 1 another 1: the answer is 2. ✓
Watch out. Doubles have two equal parts. Check that both rows match.
Key words. A double is two of the same number.
Method. A double is two equal parts. Add the number to itself.
- Find the two equal rows of 2. The two rows are the same length.2 and 2
- Count the total. Count both rows together.2 + 2 = 4
- Write the answer. 4
Check. Count on from 2 another 2: the answer is 4. ✓
Watch out. Doubles have two equal parts. Check that both rows match.
Key words. A double is two of the same number.
Method. A double is two equal parts. Add the number to itself.
- Find the two equal rows of 3. The two rows are the same length.3 and 3
- Count the total. Count both rows together.3 + 3 = 6
- Write the answer. 6
Check. Count on from 3 another 3: the answer is 6. ✓
Watch out. Doubles have two equal parts. Check that both rows match.
Key words. A double is two of the same number.
Method. A double is two equal parts. Add the number to itself.
- Find the two equal rows of 4. The two rows are the same length.4 and 4
- Count the total. Count both rows together.4 + 4 = 8
- Write the answer. 8
Check. Count on from 4 another 4: the answer is 8. ✓
Watch out. Doubles have two equal parts. Check that both rows match.
Key words. A double is two of the same number.
Method. A double is two equal parts. Add the number to itself.
- Find the two equal rows of 5. The two rows are the same length.5 and 5
- Count the total. Count both rows together.5 + 5 = 10
- Write the answer. 10
Check. Count on from 5 another 5: the answer is 10. ✓
Watch out. Doubles have two equal parts. Check that both rows match.
Key words. A double is two of the same number.
Method. A double is two equal parts. Add the number to itself.
- Find the two equal rows of 2. The two rows are the same length.2 and 2
- Count the total. Count both rows together.2 + 2 = 4
- Write the answer. 4
Check. Count on from 2 another 2: the answer is 4. ✓
Watch out. Doubles have two equal parts. Check that both rows match.
Key words. A double is two of the same number.
Method. A double is two equal parts. Add the number to itself.
- Find the two equal rows of 4. The two rows are the same length.4 and 4
- Count the total. Count both rows together.4 + 4 = 8
- Write the answer. 8
Check. Count on from 4 another 4: the answer is 8. ✓
Watch out. Doubles have two equal parts. Check that both rows match.
Key words. A double is two of the same number.
Method. A double is two equal parts. Add the number to itself.
- Find the two equal rows of 3. The two rows are the same length.3 and 3
- Count the total. Count both rows together.3 + 3 = 6
- Write the answer. 6
Check. Count on from 3 another 3: the answer is 6. ✓
Watch out. Doubles have two equal parts. Check that both rows match.
Key words. A double is two of the same number.
Method. A double is two equal parts. Add the number to itself.
- Find the two equal rows of 4. The two rows are the same length.4 and 4
- Count the total. Count both rows together.4 + 4 = 8
- Write the answer. 8
Check. Count on from 4 another 4: the answer is 8. ✓
Watch out. Doubles have two equal parts. Check that both rows match.
Key words. A double is two of the same number.
Method. A double is two equal parts. Add the number to itself.
- Find the two equal rows of 5. The two rows are the same length.5 and 5
- Count the total. Count both rows together.5 + 5 = 10
- Write the answer. 10
Check. Count on from 5 another 5: the answer is 10. ✓
Watch out. Doubles have two equal parts. Check that both rows match.
Key words. A double is two of the same number.
Method. A double is two equal parts. Add the number to itself.
- Find the two equal rows of 2. The two rows are the same length.2 and 2
- Count the total. Count both rows together.2 + 2 = 4
- Write the answer. 4
Check. Count on from 2 another 2: the answer is 4. ✓
Watch out. Doubles have two equal parts. Check that both rows match.
Method. A double has two equal parts. Check whether the two parts are the same.
- Look at 3 and 4. Are they the same number?3 and 4
- Check the parts. Three is not the same as four.3 is not 4
- Write the answer. No. A double has two equal parts. 3 and 4 are not equal.
Check. A double would be 3 + 3 or 4 + 4. ✓
Watch out. Both parts must be the same number.