Add
The answer to an addition problem is called the _____.
Sum
Pick a strategy to solve.
868 minus 276
592
Round each number to the nearest ten.
934
287
89
31
930
290
90
30
Find the sum of 312, 192, and 113.
617
Pick a strategy to subtract 767 - 382.
385
Round each number to the nearest hundred.
294
832
496
501
300
800
500
500
Consider the equation 459 + _____ = 943
Part A: Draw a bar diagram to represent the problem.
Part B: What is the missing number?
The missing number is 484
Look at the subtraction problem. Use inverse operations to check their work!
392
- 187
--------
205
187 + 205 = 392
Round to the nearest ten to estimate the difference.
187 - 52 = ?
187 rounds to 190
52 rounds to 50
Subtract 190 - 50 = 140
Select all the equations that are true.
A. 312 + 0 = 0
B. 973 + 812 = 812 + 973
C. (310 + 12) + 52 = (52 + 12) + 310
D. (27 + 3) + 310 = 310 + 30
E. 519 + 0 = 519
B, C, D, E
How can you check your work for this subtraction problem?
594 - 318 = 276
276 + 318 = 594
OR
318 + 276 = 594
937 + 293 = ?
Round 937 to 900
Round 293 to 300
Add 900 + 300 = 1,200
Use mental math to add 618 and 315. Break each number into hundreds, tens, and ones. EXPLAIN how you solved the problem!
I broke apart 618 into 6 hundreds, 1 ten, and 8 ones.
I broke apart 315 into 3 hundreds, 1 ten, and 5 ones.
I added the hundreds together to get 900, added the tens to get 20, and added the ones to get 13.
My final answer is 933
Look at the subtraction problem. What addition equation can I use to solve the problem?
982 - 361 = 621
A. 621 + 361 = 982
B. 982 - 621
C. 397 + 621 = 1,018
D. 300 + 600 = 900
A
Look at the following numbers and their labels A, B, C, and D.
252, label A
297, label B
305, label C
240, label D
Draw a number line and correctly place each label on the line.
<l----------------------l------l------------l----l-----l>
200 240 252 297 300 305
D. A B. C.