Addition & Subtraction
What is 256 + 123?
379
How did you know 6 + 6 = 12?
I added the same number twice.
176 rounded to the nearest ten is 170 or 180?
180
There are 98 pencils. Five students take 7 each. What operation should you do first?
Multiply
Which is bigger: 644 − 135 or 135 + 644?
135 + 644
What is 389 + 415?
804
How did you figure out 644 − 135?
I subtracted the ones, ten, and hundreds place.
What is 176 rounded to the nearest hundred?
200
What is 5 × 7?
35.
How does rounding help you check subtraction problems?
It helps you estimate to see if your answer makes sense.
What is 568 − 347?
221
How did you solve 537 − 299 without using a calculator?
I decomposed in the ten and hundreds place.
What is 167 rounded to the nearest ten and hundred?
170 and 200
What equation matches the problem?
98 pencils, 5 students take 7 each.
n = 98 − 5 × 7
What does the equal sign (=) mean?
Both sides are the same.
What is 541 − 228?
313
Tell me how regrouping/decomposing helps.
It lets you borrow when needed.
What is 849 rounded to the nearest hundred?
800
A teacher has 98 pencils, 5 students take 7 each. How many pencils are left after the students take some?
63
If you add 0 to a number, the number changes.
False
What is 537 + 299?
836
How did you know which math strategy to use?
I looked at the problem and chose the best way.
What is a number that rounds to 0 when rounding to the nearest hundred?
Any number from 1-50
There are 72 markers in a classroom.
6 students each take 8 markers.
Which equation shows what is left?
A. 72 − 6 = m
B. 72 − 8 = m
C. m = 72 − 6 × 8
D. 6 × m = 72 − 8
C. m = 72 − 6 × 8
Tell me how math helps you in real life.
Shopping, sharing, counting, etc.