Decomposing
12x3
How can we decompose the number 12 to help us solve it?
12 - 10 + 2
10x3 + 2x3
30 + 6 = 36
8x5
40
(2x3) + (1x2)
6+2=8
Caroline baked 7 batches of cupcakes on Saturday. Then, on Sunday, she baked 3 times as many batches of cupcakes as she did on Saturday. How many batches of cupcakes did she bake on Sunday?
27 cupcakes
A square has 4 sides. Each side measures 3ft. What is the area?
9 square feet
15
How can you decompose this number?
There are multiple answers - 10+5
11+4
8+7 etc...
9x3
27
6x7 is the same as (3x7)+(3x7)
True or False?
True
There are three school buses taking students on a field trip to the zoo. If each bus holds 12 students, how many total students are going on the field trip?
36 students
Area equals length x length x width x width
True or false?
False - Length x Width
Multiple answers - 40+5, 39+6, etc.
10x10
100
2 x (4x7)
2 x 28
28+28=56
Fernando is buying several boxes of cookies for a birthday party. There are 9 cookies in each box. If Fernando brings 7 boxes to the party, how many cookies is he bringing?
63 cookies
A rectangle has 4 sides. The lengths of those sides are 4ft, 4ft, 9ft, and 9ft. What is the area?
4x9=36 square feet
19x3
Decompose to find the answer.
10x3
9x3
30+27 = 57
12x4
48
7x6 is the same as (7x6) + (4x3).
True or False?
False
Calvin is organizing his baseball cards into stacks of ten cards each. How many baseball cards does he have if he can make 12 stacks?
120 cards
Aria bought a rug that was 14 feet wide and 3 feet long. What is the area of the rug?
10x3
4x3
30+12 = 42 square feet
14 x 9
Decompose to solve.
10x9
4x9
90+36 = 126
9x9
81
(3x7) + (3x7) =
21+21=42
or 6x7
A movie theatre has 9 rows of seats. In each row, there are 11 seats. How many total seats are in the movie theatre?
99 seats
If you have a composite shape that has a rectangle with a side of 4ft and a side of 8 ft AND a square that has 2ft on each side - what is the TOTAL area?
8x4= 32
2x2 = 4
32+4=36 square feet