Compare division & multiplication
If 10 x 9 = 90, then 90 / 9 = ?
10
10 x 9 = 90
90 / 9 = 10
40 ÷ 4 =
10
10 x 4 = 40
Any number divided by 1 is:
that same number.
Example, 20,000 / 1 = 20,000
1 / 1 = 1
12 / 1 = 12
100 / 1 = 100
12 x 2 = ?
24
check with division:
24 / 2 = 12
1100 / 10 = ?
110
check with multiplication:
110 x 10 = 1100
If 8 x 3 = 24, then 24 / 3 = ?
8
8 x 3 = 24
24 / 3 = 8
25 ÷ 1
any number divided by 1 is that same number!
25 x 1 = 25
any number MULTIPLIED by zero is:
Zero
Examples:
10 x 0 = 0
19,239 x 0 = 0
50 x 5 = ?
250
Check with division:
250 / 5 = 50
5,000 x 4 = ?
20,000
check with division:
20,000 / 4 = 5,000
If 12 x 5 = 60, 60 / 5 = ?
12
12 x 5 = 60
60 / 5 = 12
100 ÷ 10 = ?
10
10 x 10 = 100
I can check my addition by:
subtracting
Example:5 + 2 = 7
so 7 - 2 = 5
500 x 2 = ?
1,000
check with division:
1,000 / 2 = 500
Butterball chased her tail 42 spins 3 times on Monday and 2 times on Tuesday.
How many spins did she do all together?
3 + 2 = 5
42 x 5 = 210 spins all together!
800 x 2 = 1600, then 1600/2 = ?
800
800 x 2 = 1600
1600 / 2 = 800
120 ÷ 2 =
60
60 x 2 = 120
I can check my division by:
Multiplying
Example: 3 x 4 = 12
so 12 / 4 = 3
82 / 2 = ?
41
check with division:
41 x 2 = 82
Jackie is doing 30 jumping jacks per day for 15 days. How many jumping jacks did Jackie do all together?
30 x 15 = 450
check with division:
450 / 15 = 30
If 9872 x 2 = 19,744,
then 19,744 / 2 = ?
9872
9872 x 2 = 19,744
19,744 / 2 = 9872
99 ÷ 9 =
11
because 11 x 9 = 99
25 / 5 = ?
Divide then check with multiplication
25 / 5 = 5
Check: 5 x 5 = 25
432 x 2 = ?
864
check with division:
864 / 2 = 432
Mia baked 65 cookies. She wants to give the same amount of cookies to 5 of her friends. How many cookies will each friend have?
65 / 5 = 13
check with multiplication:
13 x 5 = 65