vocabulary
When you count back is the answer getting bigger or smaller?
smaller
Which is an example of counting back to solve?
1. 9-4=5
2. 2+5=7
9-4=5
What is the difference?
15-7=?
8
Count back._____=7-4
3
What is 12-5?
Think: 5+___=12
so 12-5=
7
the difference
Using a ten frame, draw a way to make a 10 to subtract 14-8.
See picture-6
What is the difference?
9-9=?
0
Count back.
10-1=
9
A'mari has 14 flowers. She gives some away. She has 8 left. How many flowers did she give away?
6
If you are giving away in a problem, will your answer be greater or smaller?
smaller
Draw a bar graph. Josephine had 8 types of nail polish. She shared 2 with Nyra. How many bottles of nail polish does she have now?
Show the model-6
What is the difference?
14-0=?
14
Count back.
_____9-2=
7
Adrianna has 13 crackers. She ate some. Now she has 5 left. Which shows a way to find how many crackers Adrianna ate?
1. 13-____=5
2. 13-2=___
3. 10-5=____
4. 3+____=5
13-___=5
What does it mean to make a 10 to subtract?
Use two ten-frames to show the total started with, the amount subtracted, and what is left.
Draw a bar graph showing the following: Evan had 10 strawberries. He gave 4 to Dylan. How many strawberries does he have now?
Look at bar model-6
What is the difference?
10-5=?
5
Count back.
11-3=_________
8
Cailey had some marbles. She gave 9 marbles away. Now she has 9 marbles. How many marbles did Cailey start with?
18
How can you use addition to solve a subtraction fact?
Use the fact family to rewrite the fact.
Draw the two step model to show 12-3=9.
Show the picture.
What is the difference?
18-6=?
12
Count back.
11-5=____
6
10 frogs are in the tree. 3 more frogs jump into the tree. Then 4 frogs jump out of the tree. How many frogs are in the tree now?
9