What to notice
Only even numbers divide by 2 with nothing left over, and every starting number on the list below is even: 2, 4, 6, up to 24. Halve an odd number like 7 and there is one left over, a remainder. This page sticks to the facts with no remainder; remainders come in 4th grade.
The answers count up by one while the starting numbers count up by two: 2 ÷ 2 = 1, 4 ÷ 2 = 2, 6 ÷ 2 = 3. Laid out like this, the list shows that halving and doubling undo each other.
Halving a two-digit number can be done in parts. Half of 24 is half of 20 and half of 4, which is 10 and 2, and 10 + 2 = 12. The same splitting idea is used for bigger division later on.
Dividing by 2 also answers “how many pairs?” 18 socks make 9 pairs, because 18 ÷ 2 = 9. Children who sort laundry or line up in twos have been doing this table for years; telling them so makes the facts feel familiar rather than new.
How to practise at home
- Share real things into two piles: crackers, coins, toy cars. Count one pile to find the answer.
- Fold paper in half and count the squares on one side, or cut a strip of 18 squares down the middle.
- Ask “what doubles to make 16?” alongside “16 ÷ 2”. The two questions have the same answer, and asking both ties halving to doubling.
- Halving facts often come quickly, which makes this a good first table for the division drill on this page.
Slips to watch for
- Doubling when asked to halve, especially on a mixed sheet, and answering 32 for 16 ÷ 2. Ask your child to read the sign aloud first.
- Halving only the tens and answering 5 for 18 ÷ 2. Split 18 into 10 and 8, halve each to get 5 and 4, and 5 + 4 = 9.
- Mixing up “divide by 2” with “divide into groups of 2”. Here both give the same answer, but saying which question you mean helps when the numbers change.