Doubles
5 + 5=
10
4 + _____ =10
6
6 + 4=10
16 + 1=
17
1 + 16=17
Gabby has 10 Taylor Swift albums. Mrs. A has 7 Taylor swift albums. How many more albums does Gabby have than Mrs. A?
Do you need to add or subtract to solve? Now solve
You need to subtract
Answer: 10-7= 3 albums
6 + 5 =
11
5 + 6 =11
4 + 4=
8
5 + ____=10
5
20-1=
19
There were 24 pieces of pizza at the party. The kids ate 16 pieces of pizza. How many pieces of pizza were left?
Do you need to add or subtract to solve? Now solve.
You need to subtract -
24-16= 8 slices of pizza are left
2 + 8 =
10
8 + 2=10
6 + 6 =
7 + _____= 10
3
3 + 7=10
29 + 1=
30
1 + 29 =30
Gabby went on a field trip. Two classes went together. Her class has 18 students and the other classroom had 19 students. How many students went on the field trip? If 4 teachers also went, how many total people went on the field trip?
You need to add.
18 + 19= 37 students
37 + 4= 41 people
7 + 4=
11
4 + 7=11
3 + 3=
6
6 + ____=10
4
4 + 6=10
26 + 1=
27
1 + 26=7
Gabby's class went to the zoo on a field trip. There were 17 lions and 33 tigers in the zoo.
How many more tigers were there than lions?
Do you need to add or subtract? Solve
You need to subtract
33-17=16 more tigers
12 + 8 =
20
Think about combinations of 10
8 + 12=20
2 + 2=
4
2 + ____=10
8 + 2=10
27-1=
26
Challenge Question!
At Canobie Lake Park there were many rides. Gabby went on the rollercoaster 6 times, the ferris wheel 5 times, the cars 4 times, the pirate ship 5 times and the swings 3 times. How many rides did she go on?
Do you need to add or subtract to solve? Now solve.
Strategy-look for combinations of 10 and doubles to help you solve.
You need to both add.
Strategy: Look for combinations of 10 to help.
6 + 5 + 4+ 5 + 3=
6 + 4 =10
5 + 5 =10
10 + 10 = 20
20 +3=23 rides
10 + 4=
14
4 + 10=14