Grade 3 · Maths · Lessons
Turn it round, split it up
🔄turn✂️split🧩group🔴dots
Turn it, split it.The big ideaTurn it, group it or split it: the dots stay the same.
How it works
Turn it round, group it or split it: the dots stay the same.
4 × 4 × 2 is the same as 4 × 8.
You can split 5 × 13 into 5 × 10 and 5 × 3.
Example 1: Group the numbers
- 4 × 4 × 2 = 4 × ?
- 4 × 2 = 8.
- So 4 × 4 × 2 is 4 × 8.
- So the answer is 8.
Example 2: Join two products
- 9 × 5 + 9 × 2 = 9 × ?
- 9 × 5 + 9 × 2 is 9 groups of 5 and 9 groups of 2.
- That is 9 groups of 7.
- So the answer is 7.
Example 3: Split a number
- 5 × 13 = 5 × 10 + 5 × ?
- 13 = 10 + 3.
- So 5 × 13 = 5 × 10 + 5 × 3.
- So the answer is 3.
Words to know
- split
- To break a number into parts.
- group
- To put numbers together in a different way.
Watch out
- The total stays the same.
- Split a hard number into easy parts.
- Check the parts add back.
Try it
- 28 ÷ 4 = 20 ÷ 4 + ? ÷ 4
- 9 × 8 = ? × 9
- 6 × 7 = 6 × 5 + ?
Answers: 1. 8 · 2. 8 · 3. 12
For grown-upsShow your child how 7 × 8 can be 7 × 5 plus 7 × 3.