Worked examples
Two examples
Example 1
3.75 × 100 =
- Multiplying by 100 moves the point 2 places to the right.
Answer: 375
Example 2
4.2 ÷ 1,000 =
- Dividing by 1,000 moves the point 3 places to the left.
- Write zeros in front to fill the places: 0.0042.
Answer: 0.0042
Where this is taught: Quiz 15: Multiplying and Dividing Decimals, “Powers of ten: the digits move, the point stays”
The drill
Ten problems
How many:
Type each answer, then press Check my answers at the bottom. Commas in large numbers are fine.Write each answer on the line. The answer key, with the reasoning, is on the last page.