Multiplying Single Digits by Nine

This video tutorial from Moomoomath and Science introduces a shortcut for multiplying single digits by nine. The trick involves two simple steps: subtracting one from the number being multiplied by nine to get the first digit, and subtracting this result from nine to get the second digit. The video provides several examples to illustrate the method, making it easier to multiply numbers like seven, eight, and nine. The tutorial concludes with a call to subscribe for daily math and science videos.

What numbers does the narrator find most challenging to multiply?

• Ten, eleven, and twelve

• Seven, eight, and nine

• Four, five, and six

• One, two, and three

What is the first step in the multiplication trick for nine?

• Divide the number by nine

• Subtract one from the number

• Multiply the number by two

• Add one to the number

In the multiplication trick, what do you do after finding the first digit?

• Multiply it by nine

• Divide it by nine

• Subtract it from nine

• Add it to nine

Using the trick, what is the result of 2 times 9?

• 22

• 20

• 18

• 16

Using the trick, what is the result of 3 times 9?

• 30

• 27

• 24

• 21

Using the trick, what is the result of 6 times 9?

• 54

• 52

• 50

• 48

Using the trick, what is the result of 7 times 9?

• 63

• 67

• 61

• 65