Area & Perimeter
Find the perimeter of a rectangle with length 8 units and width 5 units.
P=2×(8+5)= 26 units
(2x8) + (2x5)
16 + 10 = 26 units
Decompose 54 into two parts
54 = 50 + 4
54 = 40 + 14
54 = 50 + 4
54 = 27 + 27
54 = 26 + 28
54 = 25 + 29
54 = 23 + 31
54 = 22 + 32
54 = 21 + 33
54 = 20 + 34
54 = 19 + 35
54 = 18 + 36
54 = 17 + 37
54 = 16 + 38
54 = 15 + 39
54 = 14 + 40
54 = 13 + 41
54 = 12 + 42
54 = 11 + 43
54 = 10 + 44
54 = 9 + 45
54 = 8 + 46
54 = 7 + 47
54 = 6 + 48
54 = 5 + 49
54 + = 4 + 50
54 = 3 + 51
54 = 2 + 52
What is the commutative property of multiplication?
Answer: Changing order doesn’t change product: a×b=b×a
What is the place value of 7 in 4,752
Tens place (70)
What is “twenty” in Spanish?
veinte
Find the area of a square with side length 6 units
6×6=36 square units
Use decomposition to solve 7×16
7×(10+6) = (7×10) + (7 x 6)
70 + 42
70+42=112
Use distributive property to simplify 5×(6+4)
5×6 + 5×4=
30 + 20 =50
Write 3,406 in expanded form
3,000+400+6
How do you say “forty-eight” in Spanish?
cuarenta y ocho
A triangle has sides 5, 7, and 8. Find its perimeter.
5+7+8= 20 units
Decompose 81 in two ways.
81 = 80 + 1
81 = 70 + 11
What is the zero property ?
Any number times 0 equals zero , 6 x 0 = 0
What is the sum of 50,000 + 6,000 + 700 + 9
56,709
Skip count by 12's eight times
12, 24, 36, ... etc.
12, 24, 36, 48, 60, 72, 84, 96,
Find the area of a rectangle with length 10 and width 4.
Area = 10 × 4 = 40 square units
Decompose 45 and solve 3×45 using distributive property.
3 × 45 = 3 × (40 + 5) =
(3x5) + (40 x 3) = 120 + 15 = 135
15 + 120
What is the Identity Property ?
Multiplying any number by 1 keeps the number the same.
7 x 1 = 7
How do you write 1,589 in expanded form and word form
1,589
1,000 + 500 + 80 + 9
1thousand + 5hundred + 8tens + 9ones
How many times do you need to skip count by 12's to get the number 204
If I skip count by 12 seventeen times , I will get to the number 204.
12 x 17 = 204
A garden is 15m by 9m. Find its perimeter and area
Perimeter = 2 × (15 + 9) =
( 2 x 15 ) + (2 x 9)
30 + 18 = 48 meters
Perimeter = 48 meters
Area = 15 × 9 =
10 + 5
(10 x 9) + (5 x 9)
90 + 45
90
+ 45
_____________
135
Area = 135 square meters
Explain why decomposing numbers helps in multiplication.
Decomposing numbers helps by breaking difficult multiplication into smaller, easier parts using the distributive property.
Which multiplication property is shown in this example ?
4 x 7 = 7 x 4
A. Associative Property
B. Commutative Property
C. Identity Property
D. Zero Property
B. Commutative Property
Write 57,924,632,180 in word form
Word form
Fifty-seven billion, nine hundred twenty-four million, six hundred thirty-two thousand, one hundred eighty.
.
Skip count by 4 up to 40.
Answer: 4, 8, 12, 16, 20, 24, 28, 32, 36, 40