Estimating Sums
Estimating Differences
Addition
Subtraction
Mystery
100
Estimate the total number of candies by rounding to the nearest 100. 
900
100
Estimate, to the nearest hundred, the difference between the number of marbles in the two jars.
300
100
304 + 220 = _______
524
100
962 - 331 = _____
631
100
Find the sum of 523 and 377.
900
200
Estimate the total number of candies by rounding to the nearest hundred.
400
200
Estimate, to the nearest hundred, the difference between the number of candies in the two jars.
200
200
925 + 156 = _____
1,081
200
700 - 432 = _____
268
200
Find the difference between 523 and 377
146
300
Estimate the total number of candies by rounding to the nearest 100.
800
300
Estimate, to the nearest hundred, the difference between the number of clips in the two jars.
100
300
579 + 365 = _____
944
300
What is 342 subtracted from 850?
508
300
Which of the following gives a different answer from the rest?
304 + 210
201 + 313
778 - 264
600 - 188
600 - 188
400
Estimate the total number of candies by rounding to the nearest ten.
710
400
Estimate, to the nearest ten, the difference between the number of marbles in the two jars.
380
400
432 + 982 = _____
1,414
400
Which of the following gives 133?
200- 133
300 - 277
500 - 377
600 - 467
600 - 467
400
Subtract 335 from 600.
265
500
Estimate the total number of candies by rounding to the nearest ten.
850
500
Estimate, to the nearest ten, the difference between the number of candies in the two jars.
220
500
Which two numbers have a sum of 1,000?
342 873 566 127
873 and 127
500
Which two numbers have a difference of 350?
395 965 745 415
395 and 745
500
The difference between two numbers is 499. The greater of the two numbers is 842. What is the small number?
343