Let’s solve each problem step by step.
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Part 1: Write each decimal number in standard form (from expanded form)
We add the numbers together, aligning by place value.
1) 80 + 1 + 0.3 + 0.09
→ 80 + 1 = 81
→ 81 + 0.3 = 81.3
→ 81.3 + 0.09 =
81.39
2) 10 + 6 + 0.09
→ 10 + 6 = 16
→ 16 + 0.09 =
16.09
3) 30 + 4 + 0.2 + 0.08
→ 30 + 4 = 34
→ 34 + 0.2 = 34.2
→ 34.2 + 0.08 =
34.28
4) 70 + 2 + 0.07
→ 70 + 2 = 72
→ 72 + 0.07 =
72.07
5) 8 + 0.2 + 0.04
→ 8 + 0.2 = 8.2
→ 8.2 + 0.04 =
8.24
6) 100 + 20 + 3 + 0.05
→ 100 + 20 = 120
→ 120 + 3 = 123
→ 123 + 0.05 =
123.05
7) 60 + 7 + 0.1 + 0.09
→ 60 + 7 = 67
→ 67 + 0.1 = 67.1
→ 67.1 + 0.09 =
67.19
8) 40 + 1 + 0.08
→ 40 + 1 = 41
→ 41 + 0.08 =
41.08
9) 0.5 + 0.06
→ 0.5 is same as 0.50 → 0.50 + 0.06 =
0.56
10) 200 + 40 + 0.06
→ 200 + 40 = 240
→ 240 + 0.06 =
240.06
11) 3 + 0.1
→ 3 + 0.1 =
3.1
12) 10 + 1 + 0.5 + 0.03
→ 10 + 1 = 11
→ 11 + 0.5 = 11.5
→ 11.5 + 0.03 =
11.53
13) 0.2 + 0.05
→ 0.2 = 0.20 → 0.20 + 0.05 =
0.25
14) 1 + 0.07
→ 1 + 0.07 =
1.07
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Part 2: Write each decimal number in standard form (from word form)
We write the whole number part, then the decimal part based on “tenths”, “hundredths”, etc.
1. one and sixty-five hundredths
→ Whole: 1
→ Decimal: 65/100 = 0.65
→ Answer:
1.65
2. nine and two hundredths
→ Whole: 9
→ Decimal: 2/100 = 0.02
→ Answer:
9.02
3. forty-five and thirty-one hundredths
→ Whole: 45
→ Decimal: 31/100 = 0.31
→ Answer:
45.31
4. one hundred thirty-six and nine hundredths
→ Whole: 136
→ Decimal: 9/100 = 0.09
→ Answer:
136.09
5. five and twenty-one hundredths
→ Whole: 5
→ Decimal: 21/100 = 0.21
→ Answer:
5.21
6. twenty-one and six tenths
→ Whole: 21
→ Decimal: 6/10 = 0.6
→ Answer:
21.6
7. eight tenths
→ No whole number → just 8/10 = 0.8
→ Answer:
0.8
8. one hundred seventy-five and two hundredths
→ Whole: 175
→ Decimal: 2/100 = 0.02
→ Answer:
175.02
9. twenty-four hundredths
→ No whole number → 24/100 = 0.24
→ Answer:
0.24
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Final Answer:
Part 1:
1) 81.39
2) 16.09
3) 34.28
4) 72.07
5) 8.24
6) 123.05
7) 67.19
8) 41.08
9) 0.56
10) 240.06
11) 3.1
12) 11.53
13) 0.25
14) 1.07
Part 2:
1) 1.65
2) 9.02
3) 45.31
4) 136.09
5) 5.21
6) 21.6
7) 0.8
8) 175.02
9) 0.24
Parent Tip: Review the logic above to help your child master the concept of tenths and hundredths worksheet grade 4.
