2-min Fluency Warm-up — Mental math. Go fast!
67 − 10 =
34 + 10 =
55 − 10 =
23 + 10 =
Solve each problem using columns.
Think about the situation. Draw a picture or write your thinking.
A baker made 63 cookies in the morning. In the afternoon, she baked 29 more cookies. How many cookies did she make that day?
Draw or write your thinking:
cookies
The school library had 95 books. By Friday, 47 books had been checked out. How many books are still on the shelf?
Draw or write your thinking:
books
Sarah has 38 red marbles and 27 blue marbles. She wants to know her total. How many marbles does Sarah have?
Draw or write your thinking:
marbles
One of these has an error. Find it, explain the error, and fix it.
28
+ 45
63
✓ or ✗?
Explain:
Correct:
64
- 37
33
✓ or ✗?
Explain:
Correct:
Challenge: Even or Odd? Solve each problem. Is the answer even or odd?
35 + 28 =
even or odd? ____
74 − 39 =
even or odd? ____
46 + 37 =
even or odd? ____