Adding & Subtracting
a - 10 = 10
a = 20
10 x n = 700
n = 70
List all the factor pairs for 18.
1 and 18, 2 and 9, and 3 and 6
What is the least common multiple of 3 and 4?
12
add 3 and 4, add 10 and 8, and then multiply the sums
(3+4) x (10+8)
15 + a = 45
a = 30
5 x n = 75
n = 15
List all the factor pairs of 20.
1 and 20, 2 and 10, 4 and 5
What is the least common multiple of 3 and 16?
48
subtract 6 from 10, and then multiply by 8
(6-10) x 8
150 + 75 = a
a = 225
35 x n = 105
n = 3
List all the factor pairs of 50.
1 and 50, 2 and 25, 5 and 10
What is the least common multiple of 9 and 4?
36
add 10 and 15, add 9 and 3, and then subtract the sums
(10 + 15) - (9 + 3)
a - 150 = 200
a = 350
400 divided by n = 20
n = 20
List all the factor pairs of 24.
1 and 24, 2 and 12, 3 and 8, 4 and 6
What is the least common multiple of 12 and 15?
60
multiply 4 by 6, and then add 57 subtracted from 110
(4 x 6) + (110 - 57)
375 - a = 125
a = 250
125 divided by n = 25
n = 5
List all the factor pairs of 12.
1 and 12, 2 and 6, 3 and 4
What is the least common multiple of 10 and 35?
70
multiply 2 by 15, and then subtract from 5 multiplied by 11
(5 x 11) - (2 x 15)