Front-End Estimation
Addition using Regrouping
Rounding to estimate the sum
Write the Expression
Mixture
100
300
What should 327 be rounded to using front-end estimation?
100
461
What is the sum of 333 +128
100
900
What is the sum using estimating? 611 +323
100
3+2
Allison has three board games, but gets two new board games for her birthday. How many board games does she have?
100
front -end estimation
If estimating a sum by adding the front digit of each addend you are using____________________. (it is a definition)
200
800
What should 855 be rounded to if using front-end estimation?
200
688
What is the sum of 265 +423
200
400
What is the sum using estimating? 248 +174
200
13+25
Ron has 13 yellow apples and 25 red apples. How many apples does he have altogether?
200
900
Use estimation to find the sum. 420 +589
300
600
What should 599 be rounded to if using front-end estimation?
300
631
What is the sum of 192 +439
300
4,000
What is the sum using estimation? 1,659 +2,205
300
24-8
Marsha bought 24 eggs. She used 8 for breakfast. How many eggs does she have now?
300
+
Complete the number sentence by adding a + or - 419 ___ 451=870
400
90
If you add these two numbers using front end estimation your answer should be___________ 52+47
400
903
What is the sum of 734 +169
400
8,000
What is the sum using estimation? 2,798 +4,568
400
9-2
Jill bought 2 oranges, 3 apples, and 9 bananas. How many more bananas than oranges did she buy?
400
3,602
If a school has 1,523 students and another school has 2,079 students how many students would they have total?
500
120
What should the sum be if adding these two numbers using front end estimation? 61+67
500
920
What is the sum of 612 +308
500
12,000
What is sum using estimation? 6,647 +5,874
500
53+8
Mr. Lee is 53 years older then his 8 year old grandson. How old is Mr. Lee?
500
369
What is the missing number? 845-___=476
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