Transcript lesson1ppt - KristineLynch

Lesson 1: Monday
MULTIPLICATION
Kristine Lynch
MA.3.A.1.1
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
How many
groups
How many
in each group
5
x
five
times
2
Two
elephants
We can solve it by adding
=
is
2 + 2 + 2 + 2 + 2 = 10
ten elephants
EXAMPLE 2:
There are three groups, and each group has four dogs.
3 × 4 = 12
how many
groups
how many
in each group
We can solve
it by adding.
3
×
4
=
4 + 4 + 4 = 12
three
times
four dogs
is
twelve dogs
Zeros
 Any number multiplied by ZERO is ZERO!
0 cookies, each having 2 chocolate chips, equal 0 chocolate chips
0x0=0
0x1=0
0x2=0
0x3=0
0x4=0
0x5=0
0x6=0
0x7=0
0x8=0
0x9=0
1x0=0
2x0=0
3x0=0
4x0=0
5x0=0
6x0=0
7x0=0
8x0=0
9x0=0
ONES
 Any number multiplied by ONE is itself!
1 cookie having 4 chocolate chips, equals 4 chocolate chip
1x0=0
1x1=1
1x2=2
1x3=3
1x4=4
1x5=5
1x6=6
1x7=7
1x8=8
1x9=9
TWOS
5 + 5
2 x 5 = 10
2 cookies, each having 5 chocolate chips, equal 10 chocolate chips
3
+
3
2x3=6
2 cookies, each having 3 chocolate chips, equal 6 chocolate chips
 remember the TWOs is doubling
 5 doubled is 10 (5 + 5 = 10)
THREES
5
+
5
+
5
3 x 5 = 15
3 cookies, each having 5 chocolate chips, equal 15 chocolate chips
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 = 24
4 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 = 30
5 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
+
6 x 5 = 30
6 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.
5
SEVENS
8
+
8
+
8
+
8
+
8
+
8
+
8
7 x 8 = 56
7 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 = 48
8 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 = 54
6 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?