2-min Fluency Warm-up — Mental math.
500 − 100 =
200 + 100 =
800 − 100 =
300 + 100 =
3-Digit Subtraction
Subtracting 3-digit numbers: start with ones, then tens, then hundreds. Borrow if you need to.
573 − 241
Ones: 3 − 1 = 2
Tens: 70 − 40 = 30
Hundreds: 500 − 200 = 300
Answer: 332
604 − 237
Ones: 4 < 7, borrow → 14 − 7 = 7
Tens: 0 became 9 (borrowed) → 9 − 3 = 6
Hundreds: 6 became 5 → 5 − 2 = 3
Answer: 367
Use columns. Borrow when needed!
One of these has an error. Find it, explain, and fix it.
542
- 278
264
✓ or ✗?
Explain:
Correct:
705
- 348
357
✓ or ✗?
Explain:
Correct:
Think about the situation. What happens to the total?
The school had 648 pencils in the supply closet. During the year, 275 pencils were given to students. How many pencils are left?
Draw or write your thinking:
pencils