Decimal Addition and Subtraction — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. Maya buys a book for $4.75 and a snack for $2.50. How much does she spend in all?
A) $7.25
B) $6.25
C) $7.50
D) $6.75
Grade 4 students align the decimals and add: 5 + 0 hundredths = 5, 7 + 5 tenths = 12 (carry 1), 4 + 2 + 1 = 7 dollars, giving $7.25.
2. Liam has $10.00 and spends $6.85 on a toy. How much money does he have left?
A) $4.15
B) $3.15
C) $4.25
D) $3.25
Grade 4 learners regroup to subtract $6.85 from $10.00, getting $3.15 because 10.00 - 6.85 = 3.15.
3. A blue ribbon is 1.5 meters long and a red ribbon is 0.75 meters long. What is the total length?
A) 1.80 m
B) 2.25 m
C) 2.15 m
D) 2.05 m
Grade 4 students rewrite 1.5 as 1.50, then add 0.75 to get 2.25 meters.
4. Estimate 4.85 + 2.13 by rounding each number to the nearest whole number.
A) 6
B) 8
C) 7
D) 9
Grade 4 learners round 4.85 to 5 and 2.13 to 2, then add to estimate the sum as 7.
Part B: Fill in the Blank
Write the correct answer on each line.
1. Sara spends $3.40 and $1.25 at the store. Total spent: $4.65
Grade 4 students align decimals and add $3.40 + $1.25 to get $4.65.
2. A pencil costs $0.85 and an eraser costs $0.50. Total: $1.35
Grade 4 learners add $0.85 + $0.50 by aligning decimals to get $1.35.
3. Estimate 5.92 - 1.08 by rounding each number to the nearest whole: 5
Grade 4 students round 5.92 to 6 and 1.08 to 1, then subtract: 6 - 1 = 5 as the estimate.
4. A rope is 2.4 m. Tom cuts off 0.65 m. How much rope is left? 1.75 m
Grade 4 learners annex a zero to 2.4, then subtract 0.65 from 2.40 to get 1.75 meters.
5. Jen has $5.00 and spends $2.35. Money left: $2.65
Grade 4 students subtract $2.35 from $5.00 by regrouping to get $2.65.