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.

Grade 4th Grade · Math · 40 min· 4.nbt.b.5

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

Khan Academy · 8:44

Multiplying and dividing by 10, 100, 1000

3 key concepts

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.

6 questions · Multiple choice & Short answer

Quick comprehension check

“What is 30 × 7?”

Get all 3 ready-to-use resources:

Teacher GuideComplete lesson plan

Student DocPrintable student handouts

SlidesReady-to-use presentation