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Published byElla French Modified over 8 years ago

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Daily Lessons for Multiplication Unit By: Candice Cannon

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How to solve a multiplication problem by drawing a picture Sample Problem 3 x 6 = ? The first number (3) stands for the number of groups The second number (6) stands for how many are in each group Think of the multiplication symbol (x) as the words “groups of” 3 x 6 = means the same thing as 3 groups of 6 equals View screencast of drawing

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How to solve a multiplication problem by creating an array An array is like a picture but it is more organized by using columns and rows. It is easiest to draw circles or another simple shape to make your array. Sample Problem: 4 x 7 = ? The first number (4) is the number of rows The second number (7) is the number of columns or how many in each row Think of the multiplication symbol as “rows of” 4 x 7 = means 4 rows of 7 View screencast of array

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How to solve a multiplication sentence by using repeated addition Repeated addition means you add the same number over and over Example: 5 x 8 could be solved by repeatedly adding 5 eight times – 5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 = The first number (5) is the number you will repeatedly add The second number (8) is the number of times you will add the first number View screencast of repeated addition

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How to solve a multiplication problem by using skip counting Skip counting is a great strategy to combine with arrays or drawing a picture Skip counting means you count using multiples of other numbers but you don’t say every number like regular counting Example: if you wanted to count how many cars in all but you didn’t want to go 1, 2, 3, 4 you could skip count by how many are in each group (8) The problem would be 4 x 8 = ? You would say 8, 16, 24, 32 so 4 x 8 = 32 View screencast of skip counting

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How to solve a multiplication sentence using a fact you already know You can use a fact you already have memorized to quickly find out another fact you don’t know by adding or subtracting Example: you already know that 9 x 9 = 81 but you want to know what 9 x 10 = ? You could add one more group of 9 to 81 and your answer would be 90 Example: you already know that 4 x 3 = 12 but you want to know what 4 x 2 = ? You could subtract one group of 4 from 12 and your answer would be 8 View screencast of use known facts

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Blow Your Mind Fact! Multiplication follows the commutative property which means that the order of numbers doesn’t really matter (just like in addition) Example 3 + 5 = 8 and 5 + 3 = 8 Example 5 x 3 = 15 and 3 x 5 = 15 You can apply this to your work as well

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Commutative Property of Multiplication using some of our strategies to solve 4 x 2 = 8 Drawing a Picture: you could draw 4 groups of 2 or 2 groups of 4 Your answer is the same Drawing an Array: you could draw 4 rows of 2 or 2 rows of 4 Your answer is the same Repeated Addition : you can write 4 + 4 or 2 + 2 + 2 + 2 Your answer is the same Try it out on some problems, this is a tricky concept!

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