Decimal Addition and Subtraction — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. A water bottle holds 1.25 liters and another holds 0.8 liters. What is the total?
A) 1.85 L
B) 2.05 L
C) 1.95 L
D) 2.15 L
Grade 4 students rewrite 0.8 as 0.80, then add 1.25 + 0.80 to get 2.05 liters.
2. Ella runs 3.6 km on Monday and 2.45 km on Tuesday. How far did she run in all?
A) 6.05 km
B) 5.95 km
C) 6.15 km
D) 5.85 km
Grade 4 learners rewrite 3.6 as 3.60, then add 2.45 to get 6.05 kilometers.
3. Estimate $7.85 + $4.20 by rounding to the nearest dollar.
A) $11
B) $13
C) $12
D) $10
Grade 4 students round $7.85 to $8 and $4.20 to $4, then add to estimate $12.
4. A board is 4.5 ft long. A piece 1.75 ft is cut off. How long is the remaining board?
A) 2.75 ft
B) 3.25 ft
C) 2.65 ft
D) 2.85 ft
Grade 4 learners annex a zero to 4.5, making 4.50, then subtract 1.75 to get 2.75 feet.
Part B: Fill in the Blank
Write the correct answer on each line.
1. A book costs $8.95 and a pen costs $1.50. Total: $10.45
Grade 4 students add $8.95 + $1.50 by aligning decimals to get $10.45.
2. Estimate 9.78 + 3.12 by rounding each to the nearest whole: 13
Grade 4 learners round 9.78 to 10 and 3.12 to 3, then add to estimate 13.
3. A jug has 3.5 L of juice. Sam pours out 1.25 L. Juice left: 2.25 L
Grade 4 students rewrite 3.5 as 3.50, then subtract 1.25 to get 2.25 liters.
4. Mia has $20.00 and buys items totaling $13.65. Change: $6.35
Grade 4 learners subtract $13.65 from $20.00 to get $6.35 in change.
5. Two ribbons measure 0.6 m and 0.85 m. Total length: 1.45 m
Grade 4 students rewrite 0.6 as 0.60, then add 0.85 to get 1.45 meters.