In some calculations a combination of mental math and a calculator is most appropriate. For example, because
we can calculate 97 146 on a calculator and then mentally multiply by 1000. Show how to calculate each of the following using a combination of mental math and a calculator:
a. 19 5 194 2
b. 379 4 193 25
c. 8 481 73 125
d. 374 200 893 50
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