Multiplication Patterns • Squares • Area • Square Roots

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Multiplication Patterns • Squares • Area • Square Roots. BY: Philip Collins Created for Mathese-2D 2007. Vocabulary. Array-------numbers or symbols arranged in row or columns Area---------number of square units needed to cover a surface. Row-------a line in the horizontal

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### Multiplication Patterns • Squares • Area • Square Roots

BY: Philip Collins

Created for Mathese-2D 2007

Vocabulary
• Array-------numbers or symbols arranged in row or columns
• Area---------number of square units needed to cover a surface.
• Row-------a line in the horizontal
• Column-------a line in the vertical
Vocabulary Continued
• square root--------one of two equal factors of a number.
• square number--------The product when a whole number is multiplied by itself.
Multiplication Patterns
• One way to think of multiplication patterns is by using an array.
• Remember that an array is an arrangement of numbers or symbols in columns or rows.
Arrays
• 6 columns

X X X X X X

X X X X X X 2 rows

• This array is a collection of 2 rows and 6 columns

X X X X X

X X X X X

X X X X X

X X X X X

How many rows does this array have?__________

How many columns does this array have?_______

How many X’s are in this array?_____

X X X X X

X X X X X

X X X X X

X X X X X

• What multiplication problem can we make with this array?
• Because we have 4 rows and 5 columns
• We make the problem 4 x 5 = 20

Let’s practice

• array pattern
Area

What would the area if this shape be?

We will multiply 4 and 5.

will be written

in square units.

We are using

cm so the

1

2

3

4

5

2

3

4

20 square cm

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

Squares and square roots
• A square is a rectangle that has equal sides.

1

1

3 by 3

2

3

1

2 by 2

2

2

2

3

If a shape is 3 by 3, then we can say that it has a

square number of 9. Because 3x3=9. We will write

the number under square root sign. It means the

square root of. If a problem asks for the square root

of 9 then we think of the

will be 3.

1

9

2

3

4

5

6

7

8

9

Solve the problems
• Lets Practice
• square root problems