Add & Subtract within 20
What is 8 + 7?
8 + 7 =
8 + 2 + 5 =
10 + 5 = 15
What number has 6 tens and 5 ones?
65
There are 14 fish in a tank. 5 swim away. How many are left?
14 - 5 = 9 fish
How many sides does a rectangle have?
4 sides
DAILY DOUBLE
A rope is 10 cubes long. A ribbon is 6 cubes long. How much longer is the rope?
10 - 6 = 4 cubes longer
What is 16 – 8? Name the strategy you used.
16 - 8 = 8
Get to 10: 16 - 6 = 10
10 - 2 = 8
6 + 2 = 8
Doubles Strategy: 8 + 8 = 16
What is 10 more than 87?
97
Rosa had some stickers. She got 8 more and now has 17. How many did she start with?
9 stickers. (17–8=9)
The minute hand is on the 6 and the hour hand is between 8 and 9. What time is it?
8:30
You measure a desk with large blocks and get 5. Your friend uses small cubes and gets 12. Which unit is smaller?
The small cubes — more of them fit, so they are the smaller unit.
What doubles fact helps you solve 6 + 7? What is the answer?
6 + 6 = 12 so
6 + 7 = 13
Put in order from greatest to least: 101, 110, 100, 111
100 , 101 , 110 , 111
There are 9 boys and 7 girls on the bus. How many more boys than girls are there?
9 - 7 = 2 more boys
A picture graph shows: cats=3, dogs=7, fish=5. How many more dogs than cats are there?
7 - 3 = 4 more dogs
Start at 56. Skip count by 2s four times. Where do you land?
58 , 60 , 62 , 64
Make a ten to solve 8 + 6. Show every step.
8 + 6 =
8 + 2 + 4 =
10 + 4 = 14
Write >, <, or =:
5 tens 14 ones ___ 6 tens 4 ones
64 = 64
A jar had 20 jellybeans. Leo ate some, then put 4 back. Now there are 11. How many did Leo eat?
11 - 4 = 7 (before adding it back)
20 - 7 = 13 jellybeans
A square is cut into 4 equal parts. What is each part called, and what fraction of the whole is it?
Each part is a quarter (one fourth / ¼).
A pencil is 9 paper clips long. A marker is 4 paper clips longer than the pencil. How long are they end to end?
Marker = 9+4 = 13 paper clips long
End to end: 9+13 = 22 paper clips.
Find the missing number: ___ + 9 = 18. Now writeanother equation using the same three numbers.
9 + 9 = 18
18 - 9 = 9
I am a number between 100 and 120. My tens digit is 1. My ones digit is 4 more than my tens digit. What number am I?
115
(tens digit = 1, ones digit = 1+4 = 5).
Class A has 13 students. Class B has 8. They combine for a field trip, then 6 students leave early. How many students finish the trip? Write all equations.
13 + 8 = 21
21 - 6 = 15 students
Name one 2-D shape and one 3-D shape that both have at least one square face or side. How are they alike and different?
Square (2-D) and cube (3-D).
Alike: both have square faces/sides.
Different: a square is flat with 4 sides; a cube is solid with 6 square faces.
A caterpillar, a twig, and a string are measured. The twig is 3 times as long as the caterpillar. The string is 2 units shorter than the twig. If the caterpillar is 4 units, what is the total length of all three?
Caterpillar: 4 units
Twig: 4 + 4 + 4= 12 units
String: 12–2=10 units
Total: 4+12+10=26 units.