When you find out how many in all, combined, total or how much altogether what is the operation called?
addition
100
13 - 8 = 5
What is the inverse of 8 + 5 = 13
100
11-6=5
5+6=11
or
6+5=11
100
What is the inverse operation of 3+7=10
10-7=3
or
10-3=7
100
Sally had 6 seashells. Sara gave her 8 more. What is the equation AND what is the inverse operation?
6+8=14
AND
14-8=6
14-6=8
200
When you find out how many are left, or the difference, what is that operation called?
Subtraction
200
9+8=17
What is the inverse?
17-8=9
or
17-9=8
200
9-7=2
7+2=9
or
2+7=9
200
28-8=20 Which is the inverse operation?
20+8=28
or
8+20=28
200
Mrs. Thomson gave the boys 17 stickers and gave the girls 23 stickers. How many stickers do the children have in all?
Check it with the inverse operation.
17+23= 40
AND
40-23=17
40-17=23
300
What is the inverse of addition?
Subtraction
300
45+13=?
What is the inverse?
58-13=45
or
58-45=13
300
83-41=?
What is the inverse?
42+41=83
or
41+42=83
300
sixteen + nine = ____________
What is the inverse operation?
25-9=16
or
25-16=9
300
The giraffe at the zoo stood 8 metres tall. The elephant was only 4 metres tall. How much taller is the giraffe than the elephant?
Write the equation, solve it and check it with the inverse operation.
8- 4 = 4
4 = 4 =8
400
What is the inverse of multiplication?
Division
400
7+6=13....
What is the inverse?
a. 6+13=19
b. 6+7=13
c. 13-4=9
d. 13-6=7
d. 13-6=7
400
Which problem is the inverse of
24-15=___ ?
a. 24-5=19
b. 9+5= 14
c. 15+9=24
d. 159
c
400
76-32= ___
What is the inverse?
44+32=76
or
32+44=76
400
I had a bag with 278 beads. The bag had a hole and I dropped 137 beads. How many beads are left in the bag?
Check your answer using the inverse operation.
278-137=141
141+137=278
500
What is another word for the "opposite" operation?
inverse
500
Which problem would you use to check 35+63=98
a. 63+35=98
b. 98-63=35
c. 98+35=63
d. 98-20=73
b. 98-63=35
500
35 + 135 = 170
What is the inverse of 170 - 135?
500
375+27= ___
What is the inverse?
402-27=375
or
402-375=27
500
There are 84 tiles in the kitchen and 37 in the bathroom. How many tiles are there altogether?
Which problem could you use to check your answer?
a. ____ - 37=84
b. ____ - 84=37
c. ____+ 84=37
d. 37+84= _____