Decimal Addition and Subtraction — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. Grade 4: The fraction 1/4 written as a decimal is 0.25.
1/4 equals 25/100 which is 0.25.
2. Grade 4: To compute 1/4 + 0.5, convert 1/4 to 0.25 first.
Decimals make adding easier when units match.
3. Grade 4: The sum 1/4 + 0.5 equals 0.75 in decimal form.
Twenty-five hundredths plus fifty hundredths equals seventy-five hundredths.
4. Grade 4: The fraction 1/2 equals 0.5 as a decimal.
1/2 equals 50/100 or 0.5.
5. Grade 4: Adding 3/10 + 0.45 gives 0.75 when written as a decimal.
Three tenths converts to 0.30 for addition.
6. Grade 4: The sum 1/4 + 1/2 equals 0.75 in decimal form.
Common denominator gives 3/4 = 0.75.
7. Grade 4: To verify 0.75, you can write it as the fraction 3/4 in fourths.
75/100 reduces to 3/4.
8. Grade 4: The fraction 7/10 written as a decimal is 0.7.
Tenths convert directly to one decimal place.
9. Grade 4: Adding 1/2 + 0.25 gives 0.75 as a decimal sum.
Half converts to 0.50 before adding.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
1/4 as decimal
→ 0.25
0.25
1/2 as decimal
→ 0.5
0.5
1/4 + 0.5
→ 0.75
0.75
3/10 + 0.45
→ 0.75 verified
0.75 verified
Matching fraction equivalents to decimals confirms the sums.