Count how many balloons there are. How many groups of 10? How many extra 1's?
1 group of ten, 0 extra ones! = 10
If I want to ADD 10, do I move up or down on the hundred chart?
DOWN! The numbers get bigger as you move down on the hundred chart.
If I want to SUBTRACT/TAKE AWAY 10, do I move up or down on the hundred chart?
UP! The numbers get smaller as you move up on the hundred chart.
Use the hundred chart to help you add: 37 + 20 = ?
37 + 20 = 57
Move down 2 spaces to add 2 tens (20).
Use the hundred chart to help you subtract: 42 - 30 = ?
42 - 30 = 12
Move up 3 spaces to take away 3 tens (30).
Look at this incomplete number line. What is their answer going to be?
Hint: They've already added 3 tens, now they need to add the 2 ones...
77
62 - ? = 38
Hint: Count the hops on the open number line....
there are 2 ten hops and 4 one hops
24
There are 2 ten hops (20) and 4 one hops (4) = 24
What number do these base-ten blocks show?
57
5 tens and 7 ones
What number does this show?
63
What number is in the tens place?
6
What number is in the ones place?
4
