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THE BIG IDEAS OF MULTIPLICATION AND DIVISION. WHAT IS MULTIPLICATION? WHEN DO WE USE MULTIPLICATION?. WHAT IS MULTIPLICATION? WHEN DO WE USE MULTIPLICATION?. To find the total in a number of equal groups – “a quick way to add”.

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## THE BIG IDEAS OF MULTIPLICATION AND DIVISION

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**WHAT IS MULTIPLICATION?WHEN DO WE USE MULTIPLICATION?**• To find the total in a number of equal groups – “a quick way to add”**There are 4 children at a table. They each have 3 cookies.**How many cookies do they have in all?**There are 4 children at a table. They each have 3 cookies.**How many cookies do they have in all?**In our classroom there are 3 rows of desks. Each row has**5 desks. How many desks are there?**In our classroom there are 3 rows of desks. Each row has**5 desks. How many desks are there?**In our classroom there are 3 rows of desks. Each row has 5**desks. How many desks are there?**5**3 3 X 5 = 15 sq units**y**x ALGEBRA**We are going on a trip. It will take four hours if we drive**at 60 miles per hour. How far will we drive?**We are going on a trip. It will take four hours if we drive**at 60 miles per hour. How far will we drive?**We are going on a trip. It will take 4 hours if we drive at**60 miles per hour. How far will we drive? 60 60 60 60 4 x 60 = 240 miles**The store sells vanilla, chocolate, and strawberry ice**cream. You can have a sugar or biscuit cone. How many different types of ice cream cones can you buy at the store? 3 X 2 = 6 different ice cream cones**WHAT IS DIVISION?WHEN DO WE USE DIVISION?**5 friends have 15 stickers. They are going to share them fairly so that each child gets the same number of stickers. How many stickers will each child get?**5 friends have 15 stickers. They are going share them fairly**so that each child gets the same number of stickers. How many stickers will each child get?**5 friends have 15 stickers. They are going share them fairly**so that each child gets the same number of stickers. How many stickers will each child get?**5 friends have 15 stickers. They are going share them fairly**so that each child gets the same number of stickers. How many stickers will each child get? 15 ÷ 5 = 3**5 friends have 15 stickers. They are going share them fairly**so that each child gets the same number of stickers. How many stickers will each child get?**Nikki has 15 stickers. She puts 5 stickers on each page of**her sticker book. How many pages will she use?**Nikki has 15 stickers. She puts 5 stickers on each page of**her sticker book. How many pages will she use?**Nikki has 15 stickers. She puts 5 stickers on each page of**her sticker book. How many pages will she use?**Nikki has 15 stickers. She puts 5 stickers on each page of**her sticker book. How many pages will she use? 15 ÷ 5 = 3 Does this look like multiplication or division?**Nikki has 15 stickers. She puts 5 stickers on each page of**her sticker book. How many pages will she use?**5 friends have 15 stickers. They are going share them fairly**so that each child gets the same number of stickers. How many stickers will each child get?**Nikki has 15 stickers. She puts 5 stickers on each page of**her sticker book. How many pages will she use?**Children need to know their basic facts in order to do**mental math, to estimate, and to do higher level math thinking.**42**6 • X 6 = 42 • X 7 = 42 • ÷ 6 = 7 42 ÷ 7 = 7**What we want students to know about multiplication and**division • When to use multiplication and division to solve real problems. There are different models (pictures, diagrams) for these situations. • Multiplication and division are related. They both involve groups of equal size • Multiplication involves finding the total in all the groups. • Division finds the missing part (factor), when we know one part and the total (product).

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