MULTIPLICATION

Kristine Lynch

MA.3.A.1.1

Lesson 1: Monday

Times Tables Pre-test

http://multiplication.com/quiz/quickquizpretest/quiz1-9.htm

worksheet

REPEATED ADDITION

Cookie Math!

The symbol x means multiplication.

Multiplication means to have many groups of the same size.

EXAMPLE 1:

There are five groups, and each group has two elephants.

5 × 2 = 10

five timesTwo

elephantsis ten elephants

             

             

             

             

             

How many in each group

5 x 2 = 2 + 2 + 2 + 2 + 2 = 10

How many groups We can solve it by adding

EXAMPLE 2:

how many groups

how manyin each group

3 × 4    =     4 + 4 + 4 = 12

three times four dogs is twelve dogs

We can solveit by adding.

There are three groups, and each group has four dogs.3 × 4 = 12

Zeros

Any number multiplied by ZERO is ZERO!

0 x 0 = 0 0 x 1 = 0 0 x 2 = 0 0 x 3 = 0 0 x 4 = 0

0 x 5 = 0 0 x 6 = 0 0 x 7 = 0 0 x 8 = 0 0 x 9 = 0

1 x 0 = 0 2 x 0 = 0 3 x 0 = 0 4 x 0 = 0 5 x 0 = 0

6 x 0 = 0 7 x 0 = 0 8 x 0 = 0 9 x 0 = 0  

 

0 cookies, each having 2 chocolate chips, equal 0 chocolate chips

ONES

Any number multiplied by ONE is itself!

 

1 x 0 = 0 1 x 1 = 1 1 x 2 = 2 1 x 3 = 3 1 x 4 = 4

1 x 5 = 5 1 x 6 = 6 1 x 7 = 7 1 x 8 = 8 1 x 9 = 9

1 cookie having 4 chocolate chips, equals 4 chocolate chip

TWOS

2 x 5 = 102 cookies, each having 5 chocolate chips, equal 10 chocolate chips

5 + 5

remember the TWOs is doubling 5 doubled is 10 (5 + 5 = 10)

3 + 3

2 x 3 = 62 cookies, each having 3 chocolate chips, equal 6 chocolate chips

THREES

5 + 5 + 5

3 cookies, each having 5 chocolate chips, equal 15 chocolate chips

3 x 5 = 15

Skip Counting (by 3's) Skip counting is counting while skipping one or more numbers. To skip count by 3's, skip two numbers while counting.  (3...6...9...)  Many refer to this a "counting by 3's 3 x 5 is skip counting five times or 3...6...9...12...15 and you are at the answer

FOURS

6 + 6 + 6 + 6

4 x 6 = 244 cookies, each having 6 chocolate chips, equal 24 chocolate chips

Double-Double Double-double the number you are multiplying four by.  (Double it twice)

4 x 6 (Double 6 Twice) 6 doubled once is 12, 12 doubled is 24

Another way to figure the answer is double the answer you would get if you multiplied the number by 2.

6 x 2 = 12 12 x 2 = 24

FIVES

       

6 + 6 + 6 + 6 + 6

5 x 6 = 305 cookies, each having 6 chocolate chips, equal 30 chocolate chips

Skip Counting (by 5's) To skip count by 5's, skip 4 numbers while counting.  (5...10...15...20...) 

Many refer to this a "counting by 5's 5 x 6 is skip counting six times or 5...10...15...20...25...30 and you are at the

answer

SIXES

5 + 5 + 5 + 5 + 5 + 5

6 x 5 = 306 cookies, each having 5 chocolate chips, equal 30 chocolate chips

There is no easy trick to remember the sixes, this is why it is important to memorize your times tables.

SEVENS

           

8 + 8 + 8 + 8 + 8 + 8 + 8

7 x 8 = 567 cookies, each having 8 chocolate chips, equal 56 chocolate chips

There is no easy trick to remember the sevens.

EIGHTS

             

6 + 6 + 6 + 6 + 6 + 6 + 6 + 6

8 x 6 = 488 cookies, each having 6 chocolate chips, equal 48 chocolate chips

There is no easy trick to remember the eights.

NINES               

6 + 6 + 6 + 6 + 6 + 6 + 6 + 6 +6

9 x 6 = 546 cookies, each having 9 chocolate chips, equal 54 chocolate chips

Using Your Fingers - 9 x 6 = 54

Step 1: Put your hands on the table in front of you.

Step 2: Your fingers represent the numbers 1 through 10.

Step 3: - Each finger to the left of the curled finger represents 10.    - Say 10, 20, 30, 40, 50 - Each finger to the right of the curled finger represents one.     - Count 1, 2, 3, 4.  (Or 51, 52, 53, 54)   - 6 x 9 = 54

QUESTIONS?