Estimating Sums and Differences: Grade 4 Math Challenge

Lily has 45 apples. She gives 12 apples to her friend. How many apples does she have left? Estimate the difference before calculating.

• 50

• 40

• 33

• 25

A bookstore has 120 books. They sold 37 books last week. How many books are left in the store? Check if your answer is reasonable by estimating.

• 83

• 90

• 75

• 100

Tom has 78 marbles. He buys 25 more marbles. How many marbles does he have now? Estimate the total before solving.

• 103

• 110

• 95

• 90

Tags

CCSS.2.NBT.B.6

Sarah read 56 pages of her book on Monday and 34 pages on Tuesday. How many pages did she read in total? Estimate the sum first.

• 90 pages

• 80 pages

• 100 pages

• 70 pages

A farmer has 200 carrots. He sells 45 carrots at the market. How many carrots does he have remaining? Check your answer for reasonableness.

• 145

• 160

• 200

• 155

Tags

CCSS.2.OA.A.1

In a class, there are 32 boys and 28 girls. How many students are there in total? Estimate the total number of students first.

• 55

• 58

• 60

• 62

A toy store had 150 toys. They received a shipment of 75 new toys. How many toys do they have now? Estimate the total before calculating.

• 300

• 225

• 200

• 150

Emma has 90 stickers. She gives 15 stickers to her brother. How many stickers does she have left? Check if your answer is reasonable by estimating.

• 75

• 85

• 60

• 90

Tags

CCSS.2.OA.A.1

A library has 500 books. They donated 125 books to a local school. How many books are left in the library? Estimate the difference before solving.

• 250

• 450

• 375

• 400

Mark collected 60 baseball cards. He lost 18 cards. How many cards does he have now? Check your answer for reasonableness by estimating.

• 38

• 42

• 50

• 45

Tags

CCSS.2.OA.A.1