Mental Math for Third Grade

What is the sum of 56 and 23?

• 45

• 79

• 67

• 82

Tags

CCSS.3.NBT.A.2

Sara had 78 marbles and she gave 25 marbles to her friend. How many marbles does she have now?

• 45

• 53

• 33

• 60

Tags

CCSS.3.NBT.A.2

What number comes next in the pattern: 5, 10, 15, 20, __?

• 30

• 22

• 18

• 25

Tags

CCSS.2.NBT.A.2

If a pencil costs 15 cents, how much will 8 pencils cost?

• 8 pencils will cost 120 cents.

• 8 pencils will cost 150 cents.

• 8 pencils will cost 85 cents.

• 8 pencils will cost 100 cents.

Tags

CCSS.3.OA.A.1

CCSS.3.OA.A.3

CCSS.3.OA.C.7

What is the difference between 98 and 45?

• 53

• 20

• 63

• 37

Tags

CCSS.3.NBT.A.2

Find the missing number in the sequence: 25, 30, __, 40, 45

• 20

• 35

• 38

• 50

Tags

CCSS.3.OA.D.9

If a box contains 56 candies and 23 candies are taken out, how many candies are left in the box?

• 33

• 27

• 18

• 45

Tags

CCSS.3.NBT.A.2

What is the result of 87 + 36?

• 149

• 111

• 98

• 123

Tags

CCSS.3.NBT.A.2

Which number is the closest estimate to 345 - 129?

• 180

• 200

• 220

• 250

Tags

CCSS.3.NBT.A.2

CCSS.3.OA.D.8

Complete the pattern: 100, 90, 80, __, 60

• 75

• 55

• 65

• 70

Tags

CCSS.4.OA.C.5