Use mental calculations - comparable numbers, substitutions, equal differences,

Question

Use mental calculations - comparable numbers, substitutions, equal differences, or add up-to compute the exact answer: Show all steps. indicate which method you are using. 243 - 97 Use mental calculations - comparable numbers, substitutions, equal differences, or add up-to compute the exact answer: Show all steps. indicate which method you are using. 1398 + 583 Use mental calculations compatible numbers, substitutions, equal differences, or add up-to compute the exact answer. Show al steps. Indicate which method you are using. 17 + 12 + 23 + 45

Explanation / Answer

16.

(243 + 7) - (100 - 3) - (7 + 3)

(250 - 100) - 4

150 - 4 = 146

17.

1398 + 583

(1398 + 2) + (583 + 17) - (2 + 17)

1400 + 600 - 19

2000 - 19 = 1981

18.

17 + 12 + 23 + 45

= (12 + 23) + 17 + 45

= (35 + 45) + 17

= 80 + 17

= 97

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