Mental Math
What is 25 + 15?
40
What is 142 + 10 ?
152
Sam has 8 apples and buys 12 more. How many apples in all?
20 apples
What does the word sum mean?
The answer to an addition problem.
10 + ? = 30
20
What is 50 + 75?
125
What is 235 + 124 ?
359
A bus has 15 kids. 21 more get on. How many kids are on the bus?
36 kids
What does the word addend mean?
Any of the numbers being added together to find the sum.
45 + ? = 50
5
What is 99 + 11?
110
What is 456 + 231 ?
687
24 birds are in a tree. 18 more fly in. How many birds altogether?
42 birds
What is the commutative property?
The rule that says you can add numbers in any order and the sum will be the same.
? + 15 = 40
25
What is 150 + 150?
300
What is 582 + 139 ?
722
A baker made 45 cookies and 38 muffins. How many treats in all?
83 treats
What word means to find the value or close to the actual answer?
estimate
75
400
What is 678 + 255 ?
933
112 people are at the park. 89 more people arrive. How many in all are at the park?
201 people
What is the difference between an equation and an expression?
An equation has an = sign, an expression does not.
? + 250 = 1,000
750