Estimating Sums and Differences: Math Challenge for 4th Grade

Lily has 25 apples. She gives 8 apples to her friend. How many apples does she have left? Estimate the difference before calculating.

• 17

• 20

• 10

• 15

Tags

CCSS.2.NBT.B.5

A bookstore had 150 books. They sold 37 books last week. How many books are left in the store? Check if your answer makes sense by estimating.

• 113

• 120

• 90

• 100

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

Tom collected 45 baseball cards. He found 12 more cards in his attic. How many baseball cards does he have now? Estimate the total before solving.

• 50

• 60

• 45

• 57

Tags

CCSS.2.OA.A.1

Sarah read 60 pages of her book. Then she read 15 more pages. How many pages did she read in total? Estimate the sum to check your answer.

• 90

• 75

• 80

• 60

Tags

CCSS.2.NBT.B.6

A farmer has 200 chickens. He sold 45 chickens at the market. How many chickens does he have now? Estimate the difference to see if your answer is reasonable.

• 155

• 200

• 145

• 160

In a class, there are 30 students. If 5 students are absent, how many students are present? Estimate the number of present students before calculating.

• 20

• 30

• 25

• 15

A toy store had 75 toys. They received a shipment of 20 new toys. How many toys do they have now? Check your answer by estimating the total.

• 90

• 95

• 100

• 85

Tags

CCSS.2.NBT.B.6

Emma has 90 stickers. She gave 25 stickers to her friend. How many stickers does she have left? Estimate the difference to verify your answer.

• 75

• 55

• 65

• 80

A library had 500 books. They donated 125 books to a local school. How many books are left in the library? Estimate the difference to check your work.

• 300

• 350

• 375

• 400

Jake has 80 marbles. He lost 15 marbles while playing. How many marbles does he have now? Estimate the difference to see if your answer is reasonable.

• 60

• 65

• 70

• 75