A person who is calculating the exact answer to 28 x 15 mentally starts by thinking about factors of 28 and making them into multiples of 15. Which step would indicate that the person has taken the process too far

Question

Social Studies

Isabella Dyer

3 July, 05:13

A person who is calculating the exact answer to 28 x 15 mentally starts by thinking about factors of 28 and making them into multiples of 15. Which step would indicate that the person has taken the process too far

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Answers (1)

Know the Answer?

Alessandra Vincent · Answer 1

C. 3.5 * 120

Explanation:

The correct complete question should be with these options

a) 14 x 30

b) 7 x 60

c) 3.5 x 120

d) None of these

Let's consider simple mental calculation of all the options one after the other

A. 14 x 30

= 14x3x10

=42x10=420 (simple 3 steps)

B. 7x60

=42x10 = 420 (simple 2 steps)

C. 3.5x120

=3x120+120x0.5

=360+60=420 (complex steps)

The correct answer is C because it involves multiple complex steps than the other options. It easier mentally break numbers up into smaller and easier pieces of integers than working with decimals.