Grade 8 _ Mental Maths

Find the error in the problem below

19 - 2k = 3k - 1

+3k = +3k

19 + 1k = -1

-19 = -19

k = -20

• They should have divided by 1 for the last step

• They should add 19 instead of subtracting 19

• I can not find an error

• Instead of adding 3k they should subtract 3k

Tags

CCSS.HSA.REI.A.1

In my fish tank, the ratio of red fish to yellow fish is 3:5. There are 20 yellow fish. How many red fish are there?

• 18

• 12

• 4

• 15

15% of the students at orchids school travel to school by bus.If there are 300 students at orchids school, how many go to school by bus?

• 15

• 30

• 40

• 45

• 75

Tags

CCSS.6.RP.A.3C

What is the perimeter of given figure ABCDEF

• 10x+2y

• 10x-4y

• 15x+4y

• 10x+ 4y

Tags

CCSS.3.MD.D.8

Sally and javed are at point P and R in a park. they walk toward each other at same speed along the direction shown. Where they will meet??

• At 50 m from Q towards R

• At 25 m from Q towards P

• At 50 m from Q towards P

• At 25 m from Q towards R

Tags

CCSS.HSG.CO.C.11

What is there in question mark(?)

• 1

• 2

• 3

• 4

Tags

CCSS.4.OA.B.4

• 25

• 10

• 15

• 60

Tags

CCSS.7.EE.B.3

How many pumpkins are there in this picture?

• 45

• 42

• 37

• 33

Tags

CCSS.1.NBT.A.1

Solve the following

• 16

• 18

• 20

• 22

Tags

CCSS.3.OA.D.8

Solve the following

• 0

• 13

• 26

• 39

Tags

CCSS.7.NS.A.3