Unit 3

Question 1

When estimating products (multiplication) or quotients (division), you can use ____________ that are close to the original number and easy to use.

Answer 1

compatible numbers

Question 2

Using these can be helpful when estimating.

Answer 2

compatible numbers

Question 3

236 + 132

240 + 130

Answer 3

compatible numbers

Question 4

613 x 28

600 x 30

Answer 4

compatible numbers

Question 5

Numbers that are close to the given numbers that make estimation or mental calculation easier.

Answer 5

compatible numbers

Question 6

One of two numbers whose product is 1; also called multiplicative inverse.

Answer 6

reciprocal

Question 7

One of two numbers who product is 1; also called reciprocal.

Answer 7

multiplicative inverse

Question 8

The fractions 3/8 and 8/3 are ______________ because they multiply to give 1. (not multiplicative inverse)

Answer 8

reciprocal

Question 9

The fractions 3/8 and 8/3 are ______________ because they multiply to give 1. (not reciprocal)

Answer 9

multiplicative inverse

Question 10

The _______________ of 1/3 is 3 because 1/3 x 3 = 1. (not multiplicative inverse)

Answer 10

reciprocal

Question 11

The _______________ of 1/3 is 3 because 1/3 x 3 = 1. (not reciprocal)

Answer 11

multiplicative inverse

Question 12

The reciprocal of 1/5 is ___ because 1/5 x ___ = 1.

Answer 12

5

Question 13

The multiplicative inverse of 2/7 is ___ because 2/7 x ___ = 1.

Answer 13

7/2

Question 14

The reciprocal of 16 is 1/16 because 16 x 1/16 = ___.

Answer 14

1

Question 15

The multiplicative inverse of 8/3 is 3/8 because 8/3 x 3/8 = ___.

Answer 15

1