Multiplying

Multiplication

by William Downie

​Steps To SA

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​Take this problem for example 48 x 2 = ?

​Step 1. Multiply the 8 in 48 by the 2

​Step 2. Put the number in the ones place below the equation and regrop the tens if necessary

​Step 3. Multiply the 4 tens in 48 by 2

​Step 4. With nothing left to regroup, drop your final answer below

​Voila! 48 x 2 = 96

Let's practice some more​

Open Ended

Now, type a 2 digit by 1 digit expression and solve it below.

​15 x 15

• ​In a problem like this, you'll multiply the 2 ones place numbers first and put the ones place below the equation

• ​Regroup if needed

• ​Next, multiply the ones place below by the tens place and add 0 as a place holder

• ​Last, do this again except with the tens first, so our answer is 225

​HIGHER ORDER THINKING

​Solve these expressions and note your answers. Keep them ready because you will type them in for the next slide.

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​67 x 43

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​29 x 29

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​55 x 8

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​83 x 9

Multiple Choice

An apple at Clovermart costs $1.99. Luisa buys 8 apples from Clovermart. How much money does she pay for the apples?

• $1592

• $15.92

• $13.72

• $14.72

Multiple Choice

Ernest is reading a book. He notices that each page has 99 words on average. If there are 84 pages in the book Ernest is reading, how many words are there in the book?

• 8,319 words

• 8,361 words

• 8,316 words

• 8,136 words

TOP TIPS!

​Here's a tip!

​Remember that when you are multiplying numbers that are greater than 2 and 1 digits long, it's mostly the same process. Whether you're multiplying 3 digit by 2 digit or 900 digits by 1 digit, it is mostly the same process as what we've covered.

Multiple Choice

Enrico made a equation with a mistake. Can you spot and identify it?

56 x 54 = 504

• Enrico forgot to divide the added partial products by 2

• Enrico forgot to add up the partial products

• Enrico forgot to multiply 50 x 50 in 56 & 54

• Enrico forgot to add a place holder in his equation

Poll

How well do you think you are adapted to multiplying throughout this lesson from a scale from 1 to 5?

• 1

• 2

• 3

• 4

• 5

Open Ended

Explain the steps for multiplying a two digit by two digit number without looking back throughout the slides, but you can use any notes to help you with this open-ended response

Multiple Choice

Solve. 62 x 8

• 496

• 426

• 469

• 466

​Goodbye!

​Awesome job with your learning skills. I hope you learned something new in this lesson mathematicians. Always know that you can use these multiplication in the real world for calculating costs, percentages and fractions. Now, your next math class might be easier than before.

​:)