Students will review multiplication using repeated addition, a number line, and arrays. Students will also review the commutative, identiy, and zero properties of multiplication. |
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Multiplication is another way to count the total number of objects in multiple equal groups. We multiply the factors to find the product, and use the symbol "x" to represent the multiplication. We can use a number line to mulitply by skip-counting on the number line. We can also use an array of objects arranged in rows and columns. Multiply the number of objects in the rows and the number of objects in the columns to find the product. The commutative property of multiplication states that you can multiply the factors in any order and still get the same product. For example, 4 x 3 = 12 and 3 x 4 = 12 The identity property of multiplication states that the product of any number and 1 is simply that number. For example, 4 x 1 = 4 The zero property of multiplication states that the product of any number and 0 is simply 0. For example, 4 x 0 = 0
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multiplication, equal groups, factor, product, array, commutative property of multiplication, identity property of multiplication, zero property of multiplication
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There are 7 groups of 3 candies. How many candies are there in total? To find this number, we can either count by 3 seven times or we can multiply 3 by 7. When we add, we have 3 + 3 + 3 + 3 + 3 + 3 + 3 = 21 Similarly, we know 7 x 3 = 21 So, we know that there are 21 total candies. |
We see 5 squares. Each square has 4 sides. How many sides are there in total? To find this number, we can count by 4 five times by skip counting on a number line by groups of 4. Looking at the number line at the bottom of the grid, we see that 5 x 4 = 20 So, we know that there are 20 sides in total. |
The sheep are arranged in 4 rows of 6 sheep. How many sheep are there in total? To answer this, we simply multiply the number of rows by the number of sheep in each row 4 x 6 = 24 So, we know there are 24 sheep in total. |
Robot 1 moves 3 inches 6 times. Then Robot 2 moves 6 inches 3 times. Both robots move a total of 18 inches. 6 x 3 = 18 3 x 6 = 18 This illustrates that we can multiply 3 and 6 in any order and their product is still 18. |
