
Estimating Sums and Differences in Fun Math Challenges
Authored by Anthony Clark
English
3rd Grade
CCSS covered

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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Lily has 25 apples. She gives 7 apples to her friend and then buys 15 more. How many apples does she have now? Estimate the total before calculating.
20
33
25
40
Tags
CCSS.1.OA.A.1
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Tom has 40 marbles. He loses 12 marbles and then finds 8 more. How many marbles does he have now? Check your answer by estimating first.
28
32
44
36
Tags
CCSS.3.OA.D.8
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A farmer has 50 chickens. He sells 20 and then buys 10 more. How many chickens does he have now? Estimate the difference and sum.
30
25
40
60
Tags
CCSS.1.OA.A.1
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Sarah read 15 books in January and 20 books in February. If she gives away 10 books, how many books does she have left? Estimate before solving.
30
20
15
25
Tags
CCSS.2.OA.A.1
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In a classroom, there are 30 students. If 5 students leave and 10 new students join, how many students are in the classroom now? Check your answer by estimating the changes.
25
30
40
35
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A toy store had 100 toys. They sold 45 toys and then received a shipment of 30 new toys. How many toys are in the store now? Estimate the total before calculating.
100
90
70
85
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Mark has 60 stickers. He gives 15 stickers to his sister and then buys 25 more. How many stickers does he have now? Check your answer for accuracy.
70
80
50
65
Tags
CCSS.2.NBT.B.6
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