Math Review

Adding 10 & 100 to a number

100

What is 20+10

30

200

What is 30+100

130

300

What is 84+10

94

400

What is 120+100

220

500

What is 116+10

126

Skip Counting

100

What are they skip counting by?

5,10, 15,20,25,30

5's

200

What are they skip counting by?

30, 40, 50, 60,_____,80, 90

10's

300

What is the missing number?

8, 12, 16,___,24, 28.

20

400

What are they skip counting by?

15, 25, 35, 45, 55.

10's

500

What is the missing number?

14, 21, 28,____,42, 49.

35

Adding double digits

100

what is 10+15

25

200

What is 21+43

64

300

What is 18+82

100

400

What is 63+29

92

500

What is 14+66

80

subtracting double digits

100

What is 15-12

3

200

What is 44-22

22

300

What is 34-18

16

400

What is 81-36

45

500

What is 92-89

3

Math Vocabulary

100

What do we call the answer to an addition equation?

Sum

200

What do we call the answer to a subtraction equation?

Difference

300

What are strategies for adding two-digit numbers involving breaking numbers apart using place value and joining tens and ones in either order called?

regrouping

400

One way to add two-digit numbers is to break the numbers into tens and ones, add the tens and add the ones in either order, and then add these _____ sums to find the total. What kind of sums? 

partial

500

When subtracting two-digit numbers, you can subtract the tens and then subtract the ones by making a 10. What is this method called ?

Partial differences