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1 Add the Decimals
Line up the decimal points carefully. Add from right to left.
0.25 + 0.34 =
1.48 + 2.31 =
3.56 + 1.27 =
4.73 + 2.89 =
0.85 + 0.76 =
5.44 + 3.67 =
7.19 + 4.82 =
6.95 + 3.08 =
8.57 + 2.46 =
9.99 + 0.01 =
12.35 + 7.65 =
15.78 + 4.22 =
2 Line Up & Add ⬇️
Add column by column. Don't forget to carry!
3 Place-Value Addition 📊
Fill in the sum row. Carry when a column totals 10 or more.
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4 Add Decimals With Different Lengths
Tip: You can add trailing zeros — 3.5 = 3.50 — so both numbers have the same number of digits.
2.5 + 3.47 =
4.08 + 7.3 =
10 + 3.65 =
0.9 + 0.15 =
6.72 + 8 =
15.4 + 2.68 =
5 Find the Missing Decimal 🔍
What number goes in the blank?
3.45 + = 6.00
+ 2.78 = 5.90
7.63 + = 10.50
+ 8.15 = 14.00
4.09 + = 9.27
+ 3.56 = 11.11
6 Word Problems 📖
Write the equation and solve.
- 1. A pencil costs $1.25 and an eraser costs $0.79. How much do they cost together?
Equation: Answer: $
- 2. A snake is 0.85 m long. It grows 0.37 m over the summer. How long is it now?
Equation: Answer: m
- 3. Leo poured 2.45 liters of juice into a pitcher, then added 1.68 liters more. How much juice is in the pitcher?
Equation: Answer: L
- 4. A package weighs 12.75 kg. Another package weighs 8.48 kg. What is their combined weight?
Equation: Answer: kg
Ex 1: 0.59, 3.79, 4.83, 7.62, 1.61, 9.11, 12.01, 10.03, 11.03, 10.00, 20.00, 20.00
Ex 2: 6.32, 11.51, 16.25, 21.12, 45.12
Ex 3: 14.02, 42.45
Ex 4: 5.97, 11.38, 13.65, 1.05, 14.72, 18.08
Ex 5: 2.55, 3.12, 2.87, 5.85, 5.18, 7.55
Ex 6: $2.04, 1.22 m, 4.13 L, 21.23 kg