Addition
Use an addition strategy to solve:
Count up, decompose, compensation
75+32
107
Use a subtraction strategy to solve:
Count on or count back or decompose 1 addend
86-23
63
Kelly has 31 stickers. Her sister gave her 23 stickers. How many stickers did Kelly have now altogether?
Use compensation to solve
31 + 23 =
-1 +1
30 + 24 =54 stickers
Mrs. De Villier's hen laid 49 eggs and she gave 12 eggs to Ms. Birsa. How many eggs does she have now?
Use a strategy to solve
37 eggs
Amelia has some stickers. She gives Alexis 24. She has 15 left. How many total stickers did Amelia have before giving Alexis stickers? Which equation would you use to solve?
a. 24 - 15 = 9
b. 24 + 15 = 39
c. 15 - 24 = 9
a. 24 + 15 = 39
Use an addition strategy to solve:
Count up, decompose, compensation
56+25
81
Use a subtraction strategy to solve:
Count on or count back
62-47
15
Ken gets 43 marks in the first test. He gets 35 marks in the second test. How many marks does he get in all? Write the equation you would use to solve this.
Use decomposing to solve.
43 + 35 = ?
40 + 30 = 70
3 + 5 = 8
70 + 8 = 78
63 birds are sitting on a tree. Some birds flew away. Now there are 55 birds. How many birds flew away?
Write an equation you would use to solve this?
Solve using a strategy
63 - ? = 55
or
55 + ? = 63
8 birds flew away
Complete the pattern by adding 100s.
231, ______, 431, 531, ________
231, 331, 431, 531, 631
Use an addition strategy to solve:
Count up, decompose, compensation
82+69
151
Use a subtraction strategy to solve:
Count on or count back or decompose 1 addend
85-39
46
Sam has 51 cents. His brother Ron has 36 cents. They want to purchase something that costs $1.00. Do they have enough money?
Use a strategy to solve
No, they only have 0.87 cents
A fruit seller had 98 apples. He sold 55 apples to customers. How many apples does he have left to sell?
Use the number line to solve.
98-55= 43 apples
I have 2 quarters, 3 dimes, 2 nickels and 2 pennies.
How much money do I have.
$0.92 cents
Use an addition strategy to solve:
Count up, decompose, compensation
68 + 49
117
Use a subtraction strategy to solve:
Count on or count back or decompose 1 addend
97-43
54
In a classroom there are 32 boys and 39 girls. How many students are there in the classroom in all?
Use a strategy to solve
71 students
A store had 48 Halloween costumes. With some more added to the stock, the number of costumes became 76. How many costumes were added?
48 + ? = 76
76 - 48 = ?
28 costumes were added
Which number is missing in the pattern?
775, 785, 795 ____, 815
805
43+57
100
Use a subtraction strategy to solve:
Count on or count back or decompose 1 addend
82 - 56
26
If one number is 39 and the other number is 60. What is the sum of those two numbers?
Use mental math to solve.
99
During spring break, Linda planted 32 tulip plants. She gave some to her mom. Now she has 16 tulips. How many plants did she give to her mom?
16 tulips
What is 10 more than 791?
801