Mastering Multiplication of 2-Digit Numbers and Tens

This video tutorial covers multiplying two-digit numbers by multiples of 10. It introduces the problem with a real-world example, explains the box diagram method, and discusses the rules for multiplying by multiples of 10. The standard algorithm is also demonstrated. Students are given practice problems to solve independently, reinforcing the concepts taught.

What is the main objective of today's lesson?

• To learn how to divide two-digit numbers by multiples of 10

• To use grids and patterns to multiply two-digit numbers by multiples of 10

• To solve word problems involving subtraction

• To understand the concept of addition

In the problem, how many guppies did Tate have initially?

• 23

• 90

• 2070

• 1800

What is the first step in solving the problem using a box diagram?

• Subtracting the numbers

• Adding the numbers

• Breaking down the numbers into smaller parts

• Dividing the numbers

What is the partial product of 90 times 20 in the box diagram?

• 2070

• 270

• 180

• 1800

How do you find the final answer after getting the partial products?

• Divide the partial products

• Add the partial products

• Multiply the partial products

• Subtract the partial products

What is the first step in using the multiples of 10 rules?

• Add the zeros first

• Multiply the nonzero factors

• Subtract the nonzero factors

• Divide the nonzero factors

What is the result of 23 times 9 in the multiples of 10 method?

• 270

• 1800

• 2070

• 207

In the example problem, what is the result of 65 times 20?

• 2070

• 1300

• 1800

• 130

What should you remember to add in the final answer when multiplying by multiples of 10?

• The original numbers

• The nonzero factors

• The partial products

• The zeros in the factors

What is the importance of checking your answers in the practice problems?

• To make sure the numbers are even

• To ensure the answers are reasonable

• To confirm the numbers are prime

• To verify the numbers are odd