6th grade mental math

3 + 4 x 7 = (a)  

Answer explanation

PEMDAS

Multiply before you add

Tags

CCSS.7.NS.A.3

2³ + 3² = (a)  

Answer explanation

2³ = 2 x 2 x 2 = 8

3² = 3 x 3 = 9

8 + 9 = 17

Tags

CCSS.2.NBT.B.5

Tyger travels 135 miles in 3 hours. What is the unit rate?

(a)  

Answer explanation

135 / 3 = 45

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2

Which of these numbers are prime?

• 25

• 29

• 33

• 31

• 39

Tags

CCSS.4.OA.B.4

Which of these numbers have a sum of 14 and a product of 45?

​ ​ (a)   and ​ (b)  

• 5
• 9
• 1
• 2
• 3
• 4
• 6
• 7
• 8

Answer explanation

5 + 9 = 14

5 x 9 = 45

How many fifths make 3?

(a)  

Tags

CCSS.3.NF.A.1

CCSS.3.NF.A.2B

What is the value of x if x + 4 = 25?

x = (a)  

Tags

CCSS.6.EE.B.7

What is the value of this number: LXXIV

(a)  

Answer explanation

L = 50

X = 10

X = 10

IV = 4

Tags

CCSS.4.NBT.A.2

If a third of a number is 12, what is the number?

(a)  

Tags

CCSS.3.OA.A.4

Which of these numbers is NOT a factor of 36?

• 3

• 8

• 12

• 18

• 2

Tags

CCSS.4.OA.B.4