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### Course: Arithmetic>Unit 1

Lesson 4: Multiplication with arrays

# Multiplication with arrays

Let's explore this video about representing 12 with multiplication. It shows 12 as 4x3, 3x4, 2x6, 6x2, 1x12, and 12x1. This helps students understand multiplication and different group arrangements. Created by Sal Khan.

## Want to join the conversation?

• Is addition the same thing as multiplication?
• In a way, yes.

Multiplication is simply a faster method of addition. When you multiply a number by another number, you are basically adding a number the same amount of times as the other number calls for, e.g: 5*3 = 5+5+5 and 3*5 = 3+3+3+3+3.

Hope this helps!
• Multiplication is basically the other way of division,right?
• Yes. We call these inverse operations. When you multiply any number a by b, and then divide that by b, the answer will be a gain. The same goes for adding and subtracting, and exponents and logarithms.
• is this like a start to multiplication? If it is, why is it for third grade?
• Yes, groups of objects is the basic meaning of multiplication. Multiplication is taught in 3rd grade.

You don’t always have to draw groups of objects to multiply numbers, but it is good to mentally visualize groups of objects.

Have a blessed, wonderful day!
• I wonder, is there a formula that will determine, by plugging in the product number that will tell you how many ways you can arrive at the product. For example, 12 has six ways of reaching 12. Is there a formula? Is there a pattern that can be discerned?
• hi you guys are cool
• why is this in 5th grade tho-
• because they think the covid severely held students back and even if it didnt you still need practice
• can arrays be made of things other then dots?
• Yes, any group of objects organized into a rectangular grid of rows and columns might be considered an array. You could describe a checkerboard as an array of squares as an example.
• should i memorize the whole multiplication table ?
to make it easier and faster for me to calculate things