Find 3.42 − 1.9.

2.3 + 5.68 + 21.047

33.25 − 21.463

Evaluate (8.54 + 3.46) − 6.749.

57.08 + 34.71

20.11 − 13.27

62 − 9.817

35.1 + 4.89

8.01 − (2.2 + 4.67)

54 + (9.2 − 1.413)

21.3 − (19.1 − 3.22)

Make Arguments A student evaluated 19.1 + (4.32 + 6.9) and got 69.2. How can you use estimation to convince the student that this answer is not reasonable?

Lynn paid $4.75 for cereal, $8.96 for chicken, and $3.25 for soup. Show how she can use properties and compatible numbers to evaluate (4.75 + 8.96) + 3.25 to find the total cost.