Fast Math Trick for Multiplying by 5

What is the main topic of the video?

• How to multiply any number by five fast

• How to subtract numbers easily

• How to add numbers efficiently

• How to divide numbers quickly

Tags

CCSS.4.NF.B.4B

CCSS.4.NF.B.4C

What is the first step in the trick to multiply a number by five?

• Add five to the number

• Multiply the number by ten

• Cut the non-five number in half

• Subtract five from the number

Tags

CCSS.3.OA.D.9

If you have the number 6, what is the result after applying the first step of the trick?

• 3

• 0

• 12

• 6

Tags

CCSS.5.OA.B.3

What do you do after cutting the non-five number in half?

• Multiply it by five

• Add a zero to it

• Divide it by two again

• Subtract five from it

Tags

CCSS.5.OA.B.3

What is the result of 14 times 5 using the trick?

• 140

• 35

• 7

• 70

Tags

CCSS.4.NBT.B.5

What is half of 128?

• 64

• 32

• 16

• 256

Tags

CCSS.4.NF.B.4B

CCSS.4.NF.B.4C

What is the final result of 128 times 5 using the trick?

• 320

• 1280

• 640

• 64

Tags

CCSS.4.NBT.B.5

What is the result of 1300 times 5 using the trick?

• 3250

• 13000

• 130

• 6500

Tags

CCSS.4.NBT.B.5

What is the second step in the trick?

• Subtract five from the number

• Add five to the number

• Multiply the number by ten

• Write down the number you got after cutting in half

Tags

CCSS.5.OA.B.3

What should you do after writing down the half number?

• Subtract five from it

• Divide it by two again

• Add a zero to it

• Multiply it by five

Tags

CCSS.4.OA.C.5