 Ben has
18
sweatshirts.
He wants to pack them into
boxes.
He wants each box to hold 3
sweatshirts.
How many boxes does Ben
need?
 |
Step
1:
Ben wants to
separate a
group of 18 into groups of 3.
Step 2:
To solve the problem you
need to divide. 18
÷ 3.
Step
3:
You can
divide by repeated
subtraction. 18 -
3
= 15
15 -
3
= 12
12 -
3
= 9
9 -
3
= 6
6 - 3
= 3
3 -
3
= 0
Step
4:
You can
remove six 3s from
18. So he will need
6 boxes.
|
|
The third grade
students visited the zoo.
They learned that there used
to be 8 kinds of tigers.
3 of the kinds have become
extinct.
How many kinds of tigers are
left?
 |
Step
1:
How many of
the 8 kinds of
tigers remain, if 3 kinds
became extinct.
Step
2: To
solve the problem you
need to subtract,
8 - 3
Step
3:
You can
subtract by "adding
on".
3 +
?
= 8
Step
4:
3 +
5 = 8
There are
5
kinds of tigers left. |
Remember: