Sums with zeros and thought clouds
You learn to use a small sum to help you work out a bigger one.
How to work it out
- Leave the zeros out for a moment: 4 × 6 = 24.
- Then put the two zeros back: 4 × 600 = 2400.
Think of:
4 × 6 = 24
4 × 7 = ? when you know 4 × 6 = 24
- 4 × 6 = 24.
- You need one more group of 4.
- 24 + 4 = 28.
- So 4 × 7 = 28.