Area
Length = 9cm
Width = 4cm
36 cm2
Length = 8cm
Width = 3cm
What is the perimeter?
24cm
Draw an area model to solve:
35 x 4
(Must have a correct area model.)
140
Use the standard algorithm to solve:
92 x 4
368
Use any strategy to solve:
40 x 70
2800
(e.g. I know that 4 x 7 is 28, and then I need to multiply that by ten twice.)
Area = 63 in2
One side is 7in long. What's the width?
Perimeter = 42cm
Width = 9cm
What is the length?
12cm
Draw an area model to solve:
9 x 271
(Must have a correct area model.)
2,439
Use the standard algorithm to solve:
5 x 639
3,195
Use the standard algorithm to solve:
13 x 47
611
Students are putting up a banner for the holiday party at school. They are only allowed to cover 24ft2 of wall space. How many different dimensions could they use for their poster?
8x3, 3x8, 2x12, 12x2, 24x1, 1x24, 4x6, 6x4
(4 or 8 different poster sizes)
Ms. Briner is framing an art piece. The painting is 3 feet wide and 4 feet long. How much framing material does she need?
14ft
Use an area model to solve:
Laura sells homemade tomato sauce. If she uses 9 tomatoes to make one jar of sauce, how many tomatoes would she need for 115 jars?
Laura needs 1,035 tomatoes.
Use the standard algorithm to solve:
6 x 2,807
16,842
Lisa was solving 42 x 61 with the standard algorithm. She got 360. What was her mistake?
Lisa for got to add a zero before multiplying the ten's place.
Alex was solving for a the area of a rectangle with a length of 6 and a width of 5. He said the area was 22 square units. What was his mistake?
Alex found the perimeter instead of the area.
Sarah was solving for the missing side of a rectangle with a perimeter of 58 and a side length of 14. She said that the other side would be 30 units long. What was her mistake?
Sarah forgot that after she subtracts the two sides she knows, the number has to get split in half for two other sides. The missing side is only 15 units long.
Look at the area model on the board. What was the mistake?
Ian is new to collecting marbles, but his brother, Jake, has been at it a while. Ian has 102 marbles. Jake has 8 times as many as he does. How many marbles are in Jake's collection?
Joe's crab shack sells 85 crab cakes per day. How many carb cakes would they sell in the month of December?
December has 31 days. 85 x 31=2,635
Joe's would sell 2,635 crab cakes in December.
Betty is putting hardwood flooring in her bedroom. Her room is 13 feet long and 15 feet wide. How much will it cost if the flooring is $6 per square foot?
13' x 15' = 195ft2
195ft2x$6/ft = $1,170
It will cost Betty $1,170 to install hardwood in her bedroom.
Rosy had a farm with a perimeter of 84m. The length of the farm is 12m. What is the area of the farm?
84-24=60 60/2=30
30x12=360
The area of Rosy's farm is 360m2.
Over break, Angie ate 17 pieces of candy per day for a week. The next week, Angie ate 25 pieces of candy total. How many pieces of candy did Angie eat during the entire break?
17 x 7 = 119
119 + 25 = 144
Angie ate 144 pieces of candy.
Gillian spent $34 on each of her five siblings for Christmas. Then she spent $108 on each of her two parents. How much money did Gillian spend on gifts?
34x5 = $170
108x2 = $216
$170 + $208 = $378
Gillian spent $378 on Christmas presents.
Ms. Cronin made cookies for a holiday party. She made a dozen cookies each of 17 different recipes. She ate 6 of them (taste testing) and gave 58 away to other teachers. How many were left for the party?
12 x 17 = 204
204 - 58 = 146
There were 146 cookies left for the party.