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Let's solve each question step by step. The task is to determine which 10 × 10 grid (A, B, C, or D) represents the decimal number that, when added to a given decimal, results in a total of 1.00.

Each 10 × 10 grid represents 1 whole, and each small square is 0.01 (since 1 ÷ 100 = 0.01). So shaded squares represent hundredths.

We are looking for the decimal that, when added to the given number, equals 1.00. That means:

> Missing number = 1.00 – Given number

Then we need to identify which grid shows that missing decimal value.

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Question 1:

> Which 10 × 10 grid is shaded to represent the decimal number that, when added to 0.1, results in a total of 1.00?

- Missing number = 1.00 – 0.1 = 0.9
- We need a grid with 90 out of 100 squares shaded (since 0.9 = 90/100)

Look at options:
- A: 10 shaded → 0.1
- B: 20 shaded → 0.2
- C: 30 shaded → 0.3
- D: 90 shaded → 0.9

✔ Answer: D

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Question 2:

> Added to 0.4, results in 1.00

- Missing number = 1.00 – 0.4 = 0.6
- Need 60 squares shaded

Check grids:
- A: 10 shaded → 0.1
- B: 40 shaded → 0.4
- C: 60 shaded → 0.6
- D: 80 shaded → 0.8

✔ Answer: C

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Question 3:

> Added to 0.8, results in 1.00

- Missing number = 1.00 – 0.8 = 0.2
- Need 20 squares shaded

Options:
- A: 10 shaded → 0.1
- B: 20 shaded → 0.2
- C: 40 shaded → 0.4
- D: 50 shaded → 0.5

✔ Answer: B

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Question 4:

> Added to 0.98, results in 1.00

- Missing number = 1.00 – 0.98 = 0.02
- Need 2 squares shaded

Look at options:
- A: 1 shaded → 0.01
- B: 2 shaded → 0.02
- C: 3 shaded → 0.03
- D: 4 shaded → 0.04

✔ Answer: B

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Question 5:

> Added to 0.97, results in 1.00

- Missing number = 1.00 – 0.97 = 0.03
- Need 3 squares shaded

Options:
- A: 1 shaded → 0.01
- B: 3 shaded → 0.03
- C: 5 shaded → 0.05
- D: 7 shaded → 0.07

✔ Answer: B

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Question 6:

> Added to 0.95, results in 1.00

- Missing number = 1.00 – 0.95 = 0.05
- Need 5 squares shaded

Options:
- A: 1 shaded → 0.01
- B: 5 shaded → 0.05
- C: 50 shaded → 0.50
- D: 55 shaded → 0.55

✔ Answer: B

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✔ Final Answers:

1. D
2. C
3. B
4. B
5. B
6. B

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Summary:

| Question | Answer |
|--------|--------|
| 1 | D |
| 2 | C |
| 3 | B |
| 4 | B |
| 5 | B |
| 6 | B |

Let me know if you'd like this formatted as a printable answer key!