How it works
Put the ten aside, multiply, then put the ten back.
5 × 10 is 5 tens, which is 50.
50 × 9: do 5 × 9 = 45, then 45 tens is 450.
Worked examples
Times 10
- ? = 5 × 10
- 5 × 10 is 5 tens.
- 5 tens is 50.
- So the answer is 50.
The other way
- 7 × 10 = ?
- 7 × 10 is 7 tens.
- 7 tens is 70.
- So the answer is 70.
A multiple of ten
- 50 × 9 = ?
- Do 5 × 9 first.
- Then put the ten back: 45 tens.
- So the answer is 450.
A taste of the worksheet
These are the first problems of set A. The printable sheet has many more, with an answer key.
- 8 × 10 = __
- 3 × 10 = __
- __ = 8 × 10
- 3 × 30 = __
- __ = 3 × 10
Words to know
- multiple
- A number you get by counting in steps of another.
- ten
- A group of 10.
Watch out for
- Put the ten back at the end.
- Times ten shifts the digits one place.
- Check the size: 50 × 9 is a bit under 500.