Worked examples
Two examples
Example 1
4.7 + 0.38 =
- Line up the points and write a zero: 4.70 + 0.38.
- Add as with whole numbers and bring the point straight down. The estimate, about 5, agrees.
Answer: 5.08
Example 2
12.5 + 3.75 + 6 =
- Every whole number has a point at the end: 6 is 6.00.
- Line up: 12.50 + 3.75 + 6.00.
Answer: 22.25
Where this is taught: Quiz 14: Adding and Subtracting Decimals, “The padding is now a necessity”
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.