CHAPTER 2

Question 1

Estimate

Answer 1

A calculated guess that is close to the exact number

Question 2

Reasonable

Answer 2

An estimate that is close to the actual answer

Question 3

Front-End Estimation

Answer 3

Using the front digit to get an estimate
Example: 324 estimate would be 300
3,425 would round to 3,000
657 would round to 600

Question 4

Rounding

Answer 4

To give an approximate value
Example: round to the nearest hundred
3,425 would round to 3,400
879 would round to 900

Question 5

Product

Answer 5

Answer when one number is multiplied by another

Example: 67 x 42 = 2,814 ( 2,814 is the product )

Question 6

Quotient

Answer 6

Answer when one number is divided by another

Example: 129 / 3 =43 (43 is the quotient )

Question 7

Divisor

Answer 7

The number in the division problem that is divided into the dividend
Example: 129 / 3 = 43 ( 3 is the divisor )

Question 8

Dividend

Answer 8

The number in a division problem that is being divided

Example: 129 / 3 = 43 ( 129 is the dividend )

Question 9

Factor

Answer 9

The numbers that you multiply to get the product or multiple
Example: 3 x 4 = 12
2 x 6 = 12
1 x 12 =12
1,2,3,4,6,and 12 are all factors of 12

Question 10

Multiple

Answer 10

The product or answer to a multiplication problem
Example: list the multiples of 12.
12, 24, 36, 48, 60,….. ( do not include zero when listing
Multiples. )

Question 11

Least common multiple

Answer 11

The SMALLEST multiple two or more numbers have in common
Example: list the multiples of 6 and 8
6: 6, 12, 18, 24, 30 ,36, 42, 48….
8: 8, 16, 24, 32, 40, 48, 56……
LCM ( least common factor ) is 24

Question 12

Common factor

Answer 12

A factor that two or more numbers have in common
Example: list factors of 4 and 6
4: 1, 2, 4
6: 1, 2, 3, 6
A common factor of 4 and 6 is 2 ( do not use 1 as a common
Factor )

Question 13

Greatest common factor (GCF )

Answer 13

The LARGEST factor that two or more numbers have common
Example: find the GCF of 12 and 36
12: 1, 2, 3, 4, 6, 12
36: 1, 2, 3, 4, 6, 9, 12, 18, 36
*GCF = 12

Question 14

Prime number

Answer 14

A number that has ONLY TWO factors- 1 and itself.
Examples: 5 ( only factors of 5~ 1 and 5 )
13 ( only factors of 13 ~ 1 and 13)
The number 1 is NEITHER prime or composite it only has
One factor, which is itself.

Question 15

Composite number

Answer 15

A number that has THREE or more factors
Examples: 16~ factors of 16: 1, 2, 4, 8, 16
30~ factors of 30: 1, 2, 3, 5, 6, 15, 30