Transcript Slide 1

Multiplication and Division problems
use the same numbers.
These groups of numbers are called
number or fact families
21 x
They all fit
together.
÷
7
3
Once you know the numbers in the
number family, you’ll be able
to memorize all of your
multiplication and division problems!
It’s
a
SLAM dunk!
7
3
21
21
x
x
÷
÷
3
7
7
3
=
=
=
=
21
21
3
7
Use the numbers 8 and 5
Start with the number 8
8
5
40
40
x
x
÷
÷
5
8
8
5
= 40
= 40
= 5
= 8
Now, let’s try some multi-digit
multiplication!
312
x 4
12
, 48
1. First multiply 4x2 = 8
2. Next multiply 4x1 = 4
3. Last multiply 4x3 = 12
Let’s try more!
1
414
x 4
16
, 56
1. First multiply 4x4 = 16
2. Put the 6 in the ones place and
carrying the 1 to the tens place.
3. Next multiply 4x1 = 4 and add
the 1 that was carried. 4+1 = 5
4. Last multiply 4x4 = 16
Are you ready for one more?
3 5
547
x 8
, 76
43
1. First multiply 8x7 = 56
2. Put the 6 in the ones place and
carrying the 5 to the tens place.
3. Next multiply 8x4 = 32 and add
the 5 that was carried. 32+5 = 37
4. Put the 7 in the tens place and
carrying the 3 to the hundreds
place.
5. Last multiply 8x5 = 40 and add
the 3 that was carried. 40+3 = 43
Let’s Practice!
Solve these problems on a piece of paper.
345
x 6
698
x 7
Click to see answers
Answers
2 3
345
x 6
2,070
6 5
698
x 7
4,886