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For part (a) of the question, we are asked to select two of the number cards in a way that their sum forms a whole number. Let's analyze the numbers:

The number cards are:
- 4.5
- 7.02
- 0.6
- 0.98

### (a) Solution:
To make a whole number, the decimal parts of the numbers must add up to 1 (or multiples of 1). 
- \( 4.5 + 0.5 = 5 \) (whole number)
  Therefore, \( 4.5 + 0.5 = 4.5 + 0.98 \) gives a whole number \(5.48\), which is wrong.

The correct combination might

Choose two of the cards to make the answer to this calculation a whole number. Choose two of the cards to make the answer to this calculation as large as possible.

In this exercise, students are asked to choose two decimal numbers to make a whole number and to find the largest possible sum. This problem covers key mathematical concepts related to decimals and addition, suitable for students in Grades 4-6.

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