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13 47. Regroup so that the first two numbers are together. Their sum is 0!
14 5. Regroup so that the second two numbers are together.
15 70. Regroup so that the first two numbers are together. The fraction reduces to make the multiplication easier.
16 110. Regroup so that the second two numbers are together. The multiplication is simple!
17 5. Switch the order of the second and third numbers.
18 470. Switch the order of the second and third numbers.
19 78. Switch the order of the second and third numbers.
20 8. Switch the order of the second and third numbers.
21 560. There’s a lot of switching that goes on here to make the problem easier. Your goal is to be able to multiply fractions times numbers that will eliminate their denominators. In this particular problem, I’m bringing the
Then I group, reduce, multiply, and find the product of the three “nice” numbers!
22 –11 and
23
24
25 1 and –1. The sum of –1 and 1 is 0; the product of –1 and –1 is 1. The number is its own multiplicative inverse.
26
You’ll see more on working with fractions in Chapter 4.
27
There’s a full coverage of fractions in Chapter 4.
28 Use 8. The additive inverse of –8 is 8. If you add 8 to the expression, you have
29 Use –6. The additive inverse of 6 is –6. If you add –6 to the expression, you have
30 Use
