Estimating and Checking Two-Digit Sums Fun!

Lily has 23 apples and her friend gives her 15 more. How many apples does Lily have now? Estimate the sum first.

• 35

• 40

• 38

• 28

Tom has 34 marbles and he buys 26 more. How many marbles does he have in total? Check if your answer is reasonable by estimating.

• 60

• 70

• 50

• 80

Tags

CCSS.2.NBT.B.6

A bakery sold 45 cupcakes in the morning and 28 in the afternoon. How many cupcakes did they sell altogether? Estimate the total first.

• 60

• 73

• 80

• 50

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

Sarah read 12 pages of her book on Monday and 29 pages on Tuesday. How many pages did she read in total? Check if your answer makes sense.

• 41 pages

• 25 pages

• 50 pages

• 30 pages

Tags

CCSS.2.OA.A.1

In a toy store, there are 56 toy cars and 34 toy trucks. How many toy vehicles are there in total? Estimate the sum before calculating.

• 80

• 90

• 100

• 70

A farmer has 47 chickens and buys 22 more. How many chickens does he have now? Check if your answer is reasonable by rounding.

• 69

• 82

• 58

• 75

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

Emma collected 38 stickers and her brother gave her 14 more. How many stickers does she have now? Estimate the total first.

• 60

• 52

• 48

• 40

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

There are 21 students in one class and 36 students in another class. How many students are there in both classes? Check if your answer is reasonable.

• 45

• 57

• 50

• 30

Tags

CCSS.2.OA.A.1

A library has 64 fiction books and 29 non-fiction books. How many books are there in total? Estimate the sum before calculating.

• 75

• 82

• 100

• 93

Jack has 52 toy soldiers and he receives 18 more as a gift. How many toy soldiers does he have now? Check if your answer makes sense.

• 70

• 50

• 65

• 80

Tags

CCSS.2.OA.A.1