Multiplication Techniques and Methods

The video introduces a math trick for multiplying two to three-digit numbers without a calculator. It demonstrates the technique using three examples: multiplying 62 by 63, 123 by 14, and 315 by 43. The method involves multiplying the first and last digits, using a 'rainbow technique' for the middle term, and carrying over numbers as needed. This approach can be faster than using a calculator with practice.

What is one potential advantage of using the multiplication technique discussed in the video?

• It requires no practice to master.

• It only works for numbers less than 50.

• It can be faster than using a calculator with practice.

• It always gives a four-digit answer.

Tags

CCSS.5.NBT.B.5

In the example 62 * 63, what is the first step in the multiplication technique?

• Multiply the first digits of each number.

• Use a calculator.

• Multiply the last digits of each number.

• Add the two numbers.

What is the result of multiplying the last digits in the example 62 * 63?

• 12

• 36

• 18

• 6

Tags

CCSS.5.NBT.B.5

In the example 123 * 14, what is the first digit of the final answer?

• 2

• 4

• 1

• 3

Tags

CCSS.7.EE.B.3

How is the middle term calculated in the example 123 * 14?

• By adding the products of the outer and inner digits.

• By subtracting the products of the outer and inner digits.

• By multiplying the first and last digits.

• By dividing the sum of the digits by two.

Tags

CCSS.5.NBT.B.5

In the example 315 * 43, what is the first step in the multiplication technique?

• Multiply the first digits of each number.

• Use a calculator.

• Multiply the last digits of each number.

• Add the two numbers.

Tags

CCSS.5.NBT.B.5

What is the result of the rainbow method for the first part of the example 315 * 43?

• 23

• 20

• 15

• 12

Tags

CCSS.5.NBT.B.5

In the example 315 * 43, what is the final answer?

• 13445

• 13545

• 14535

• 12545

Tags

CCSS.5.NBT.B.5

What is the purpose of carrying numbers to the left in this multiplication technique?

• To increase the final answer.

• To adjust the middle term.

• To ensure correct digit placement.

• To simplify the calculation.

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Which method is used to calculate the middle term in the examples provided?

• The subtraction method.

• The addition method.

• The division method.

• The rainbow method.

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6