How to Multiply Decimal Numbers by 10s, 100s and 1000s (Powers of 10)?
Concepts Explained
1. Find the product of 3.216 and 10.
3.216 × 10 = 32.16
When you multiply a decimal number by 10, its decimal point moves 1 place to the right.
Quick trick: Since there is 1 zero in 10, move the decimal point 1 place to the right.
Quick trick: Since there is 1 zero in 10, move the decimal point 1 place to the right.
2. Find the product of 3.216 and 100.
3.216 × 100 = 321.6
When you multiply a decimal number by 100, its decimal point moves 2 places to the right.
Quick trick: Since there are 2 zeroes in 100, move the decimal point 2 places to the right.
Quick trick: Since there are 2 zeroes in 100, move the decimal point 2 places to the right.
3. Find the product of 3.216 and 1000.
3.216 × 1000 = 3216.0 = 3216
When you multiply a decimal number by 1000, its decimal point moves 3 places to the right.
Quick trick: Since there are 3 zeroes in 1000, move the decimal point 3 places to the right.
Quick trick: Since there are 3 zeroes in 1000, move the decimal point 3 places to the right.
4. What is 3.216 × 200?
3.216 × 200
= 3.216 × 2 × 100
= 6.432 × 100
= 643.2
= 3.216 × 2 × 100
= 6.432 × 100
= 643.2
200 = 2 × 100
3.216 × 2 = 6.432
3.216 × 2 = 6.432