1. Some dividing examples
When do you divide?
Some dividing examples

2. You Divide when you want to know:
How many equal groups there are.
How many there are in each equal part or equal share of a group.

3. Eight children were skating in two equal groups.
x x x x
How many children were in each group?

4. Is the division question, “How many are there in each ½ of 8?”
x x x x x x x x
Is the division question, “How many are there in each ½ of 8?”

5. yes
In another place, 15 children were skating, 5 in each group.
How many groups did that make?

6. If you said 3, you are correct.
Is the division question, “How many 5’s are in 15?”
yes!

7. Next problem
Sam found 12 sticks for making a fire. He started the fire with only 1/3 of them. How many of the sticks did Sam use to start the fire?

8. We say
“How many is 1/3 of 12?

9. Next problem
After getting warm, 20 kids went out to skate, 4 to a group. How many groups did that make?

10. Well, how many groups of 4 are in 20?
Yes, 5.
Now find these four facts in the x’s.
4 x 5 = divided by 5 = 4
5 x 4 = divided by 4 = 5
x x x x x

11. 4, 5, and 20
x x x x x
These four facts make the whole story in M. and D. about 4, 5, and 20.

12. Your turn
Say three other facts that go with each of these:
3 x 9 = 27
12 divided by 2 = 6
28 divided by 7 = 4

13. A whole story
Every M. or D. fact, except one like 4 x 4 = 16 or
9 divided by 3 = 3, goes with three other facts to make a whole story in multiplication and division.

14. Your turn 3, 4, and 12 3, 6, and 18 6, 4, and 24 4, 8, and 32
Write the whole stories in M. and D. about:
3, 4, and 12
3, 6, and 18
6, 4, and 24
4, 8, and 32
4, 9, and 36

15. How well do you remember how to divide?
To be able to divide quickly and correctly, you must:
Know all the division facts (D. facts)
Start to divide at the left
Write quotient figures in their correct place
Know how to check (by multiplying the quotient by the divisor.