Let’s solve each problem step by step. We’re adding and subtracting decimals less than 1, without regrouping — that means we can just line up the decimal points and add or subtract digit by digit.
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Addition Problems (Left Column):
1.
0.7 + 0.1
→ 7 tenths + 1 tenth = 8 tenths →
0.8
2.
0.3 + 0.6
→ 3 tenths + 6 tenths = 9 tenths →
0.9
3.
0.1 + 0.5
→ 1 tenth + 5 tenths = 6 tenths →
0.6
4.
0.2 + 0.7
→ 2 tenths + 7 tenths = 9 tenths →
0.9
5.
0.49 + 0.40
→ Align decimals:
0.49
+ 0.40
------
0.89 →
0.89
6.
0.01 + 0.44
→ 0.01
+ 0.44
------
0.45 →
0.45
7.
0.63 + 0.06
→ 0.63
+ 0.06
------
0.69 →
0.69
8.
0.14 + 0.24
→ 0.14
+ 0.24
------
0.38 →
0.38
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Subtraction Problems (Right Column):
1.
0.9 - 0.2
→ 9 tenths - 2 tenths = 7 tenths →
0.7
2.
0.8 - 0.5
→ 8 tenths - 5 tenths = 3 tenths →
0.3
3.
0.7 - 0.6
→ 7 tenths - 6 tenths = 1 tenth →
0.1
4.
0.5 - 0.3
→ 5 tenths - 3 tenths = 2 tenths →
0.2
5.
0.84 - 0.72
→ 0.84
- 0.72
------
0.12 →
0.12
6.
0.37 - 0.25
→ 0.37
- 0.25
------
0.12 →
0.12
7.
0.78 - 0.28
→ 0.78
- 0.28
------
0.50 → which is
0.5
8.
0.27 - 0.26
→ 0.27
- 0.26
------
0.01 →
0.01
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All calculations checked carefully. No regrouping needed in any case — all digits subtract cleanly without borrowing.
Final Answer:
0.7 + 0.1 = 0.8
0.3 + 0.6 = 0.9
0.1 + 0.5 = 0.6
0.2 + 0.7 = 0.9
0.49 + 0.40 = 0.89
0.01 + 0.44 = 0.45
0.63 + 0.06 = 0.69
0.14 + 0.24 = 0.38
0.9 - 0.2 = 0.7
0.8 - 0.5 = 0.3
0.7 - 0.6 = 0.1
0.5 - 0.3 = 0.2
0.84 - 0.72 = 0.12
0.37 - 0.25 = 0.12
0.78 - 0.28 = 0.5
0.27 - 0.26 = 0.01
Parent Tip: Review the logic above to help your child master the concept of adding and subtracting decimals worksheet.
