Multiplying by Multiples of 10
4th Grade•40 minutes•4.NBT.B.5
Learning Objective
I can multiply a two-digit multiple of 10 by a one-digit number.
Key Concepts
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.
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.
Use the same idea for other problems: 60 × 9 = 540.
Practice Questions
This lesson includes 6 practice questions to reinforce learning.
View questions preview
1. What happens to the digits in a number when you multiply it by 10?
2. Solve: 60 x 4 = ?
3. What happens to the digits in a number when you divide it by 10?
...and 3 more questions
Educational Video
Multiplying and dividing by 10, 100, 1000
Khan Academy