What happens to the digits in a number when you multiply it by 10?

The digits shift one place to the left.

What happens to the digits in a number when you divide it by 10?

The digits shift one place to the right.

Name: Multiplying by Multiples of 10
Author: Insta~Lesson

4th Grade · Math · 40 min· 4.nbt.b.5

I can multiply a two-digit multiple of 10 by a one-digit number.

1
When you multiply a number by 10, every digit shifts one place to the left and you add a trailing zero, so 237 × 10 = 2370.
2
To multiply a two-digit multiple of 10 by a one-digit number, multiply the tens digit by the one-digit and then add a trailing zero: 70 × 4 → 7 × 4 = 28 so 70 × 4 = 280.
3
Use the same idea for other problems: 60 × 9 = 540.

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