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Multiplication Flashcards

Chapter 5 / Set (30 cards)
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Multiply 8 * 900 in your head
7200
Got it
Multiply 7 * 500 in your head
3500
Got it
Multiply 6 * 400 in your head
2400
Got it
Multiply 2 * 900 in your head
1800
Got it
Multiply 5 * 400 in your head
2000
Got it
Multiply 6 * 60 in your head
360
Got it
Multiply 9 * 50 in your head
450
Got it
Multiply 8 * 20 in your head
160
Got it
Multiply 5 * 60 in your head
300
Got it
If you're multiplying a single digit by a multiple of 10, which digit in the multiple should you forget but then attach to your final answer?
The zero or zeros
Got it
Using only your mental calculator, what is 4 * 500?
2,000
Got it
How do you multiply 3 * 700 in your head?
First, forget the two zeros in 700. Next, multiply 3 * 7 to get 21. Finally, attach the forgotten two zeros to get the final answer: 2,100.
Got it
Multiply 3 * 70 in your head.
210
Got it
Multiply 7 * 40 without using a pencil and paper, calculator or other device and explain your steps.
First, forget the zero. Second, multiply 7 * 4 to get 28. Finally, attach the forgotten zero, to get the final answer 280.
Got it
40 is a multiple of what 2-digit number?
The number 40 is a multiple of 10 because it can be evenly divided by 10.
Got it
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30 cards in set

Flashcard Content Overview

Have you always used paper and pencil or a calculator to multiply? Well, not anymore! This flashcard set will teach you how to multiply single digits and multiples of 10 or higher using mental math. For example, you'll learn that multiples of 10 can be evenly divided by the number 10. How? By simply ignoring the zeros, multiplying the numbers and then attaching the forgotten zeros at the end of the product. After reviewing the flashcards, you will be impressed by how well you can solve multiplication problems using mental math!

Front
Back
40 is a multiple of what 2-digit number?
The number 40 is a multiple of 10 because it can be evenly divided by 10.
Multiply 7 * 40 without using a pencil and paper, calculator or other device and explain your steps.
First, forget the zero. Second, multiply 7 * 4 to get 28. Finally, attach the forgotten zero, to get the final answer 280.
Multiply 3 * 70 in your head.
210
How do you multiply 3 * 700 in your head?
First, forget the two zeros in 700. Next, multiply 3 * 7 to get 21. Finally, attach the forgotten two zeros to get the final answer: 2,100.
Using only your mental calculator, what is 4 * 500?
2,000
If you're multiplying a single digit by a multiple of 10, which digit in the multiple should you forget but then attach to your final answer?
The zero or zeros
Multiply 5 * 60 in your head
300
Multiply 8 * 20 in your head
160
Multiply 9 * 50 in your head
450
Multiply 6 * 60 in your head
360
Multiply 5 * 400 in your head
2000
Multiply 2 * 900 in your head
1800
Multiply 6 * 400 in your head
2400
Multiply 7 * 500 in your head
3500
Multiply 8 * 900 in your head
7200
Multiply 7 * 700 in your head
4900
Multiply 1 * 90 in your head.
90
Multiply 2 * 80 in your head.
160
Multiply 4 * 60 in your head.
240
Multiply 9 * 90 in your head.
810
Multiply 5 * 50 in your head.
250
Multiply 7 * 70 in your head.
490
Multiply 1 * 200 in your head.
200
Multiply 2 * 300 in your head.
600
Multiply 5 * 600 in your head.
3000
Multiply 7 * 800 in your head.
5600
Multiply 3 * 60 in your head.
180
Multiply 2 * 90 in your head.
180
Multiply 3 * 600 in your head.
1800
Multiply 5 * 500 in your head.
2500

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You are viewing lesson Lesson 5 in chapter 5 of the course:

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Math Flashcards

9 chapters | 52 lessons | 52 flashcard sets

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