Students practice converting expanded number sentences into standard numerical form.

Let's solve each problem by adding the numbers together and writing them in standard form (which means combining all the values into a single decimal number).

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1) 500 + 90 + 0.2

- 500 + 90 = 590
- 590 + 0.2 = 590.2

✔ Answer: 590.2

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2) 10 + 2 + 0.7 + 0.04

- 10 + 2 = 12
- 12 + 0.7 = 12.7
- 12.7 + 0.04 = 12.74

✔ Answer: 12.74

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3) 7 + 0.8 + 0.09 + 0.003

- 7 + 0.8 = 7.8
- 7.8 + 0.09 = 7.89
- 7.89 + 0.003 = 7.893

✔ Answer: 7.893

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4) 400 + 60 + 5 + 0.3 + 0.001

- 400 + 60 = 460
- 460 + 5 = 465
- 465 + 0.3 = 465.3
- 465.3 + 0.001 = 465.301

✔ Answer: 465.301

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5) 9 + 0.5 + 0.04

- 9 + 0.5 = 9.5
- 9.5 + 0.04 = 9.54

✔ Answer: 9.54

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6) 200 + 30 + 4 + 0.1 + 0.05

- 200 + 30 = 230
- 230 + 4 = 234
- 234 + 0.1 = 234.1
- 234.1 + 0.05 = 234.15

✔ Answer: 234.15

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7) 100 + 8 + 0.7 + 0.03

- 100 + 8 = 108
- 108 + 0.7 = 108.7
- 108.7 + 0.03 = 108.73

✔ Answer: 108.73

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8) 50 + 6 + 0.9 + 0.02 + 0.004

- 50 + 6 = 56
- 56 + 0.9 = 56.9
- 56.9 + 0.02 = 56.92
- 56.92 + 0.004 = 56.924

✔ Answer: 56.924

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9) 8 + 0.1

- 8 + 0.1 = 8.1

✔ Answer: 8.1

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10) 3 + 0.8 + 0.06 + 0.002

- 3 + 0.8 = 3.8
- 3.8 + 0.06 = 3.86
- 3.86 + 0.002 = 3.862

✔ Answer: 3.862

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11) 90 + 1 + 0.4

- 90 + 1 = 91
- 91 + 0.4 = 91.4

✔ Answer: 91.4

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12) 600 + 20 + 5 + 0.09

- 600 + 20 = 620
- 620 + 5 = 625
- 625 + 0.09 = 625.09

✔ Answer: 625.09

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✔ Final Answers:

1) 590.2
2) 12.74
3) 7.893
4) 465.301
5) 9.54
6) 234.15
7) 108.73
8) 56.924
9) 8.1
10) 3.862
11) 91.4
12) 625.09

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