2-min Fluency Warm-up — Mental math: add or subtract 10.
42 + 10 =
75 − 10 =
36 + 10 =
88 − 10 =
Number Talk — Read each situation. Do you ADD or SUBTRACT? Explain WHY.
You had 24 marbles. Your friend gave you 18 more.
Add or subtract? ______
Why?
There were 67 birds on the wire. 32 flew away.
Add or subtract? ______
Why?
The bookshelf held 35 books. You added 28 more.
Add or subtract? ______
Why?
The cookie jar had 83 cookies. Someone ate 41.
Add or subtract? ______
Why?
Read each problem carefully. Decide if you add or subtract, then solve.
28 + 35 =
72 − 28 =
46 + 37 =
85 − 39 =
Find the missing number.
8 + = 15
− 7 = 20
+ 36 = 84
91 − = 57
Challenge — Write 2 addition problems and 2 subtraction problems.
Make them interesting! Use numbers you find cool.
Addition 1:
Addition 2:
Subtraction 1:
Subtraction 2: