Multiplication and Division
Use an array (box method) to solve:
10 x 15
See board
Complete with >, <, or =
2/3 ____ 4/6
2/3 = 4/6
Ms. Scallon ran 8 miles a day for 3 days. Then she ran 6 miles a day for 5 days. How far did she run?
54 miles
4/10 = ___/100
40/100
Ms. Dougherty has 1/3 of a pie. Ms. Scallon has 1/6 of a pie.
If the pies are the same size, who has a smaller piece?
Ms. Scallon
Use an array (box method) to solve:
14 x 15 =
See board
Complete with >, <, or =
4/8 ____ 5/12
4/8 > 5/12
Ms. Scallon wants to run 100 miles over the next few weeks. She ran 8 miles a day for 3 days. Then she ran 6 miles a day for 5 days. How many more miles does she have to run to reach her goal?
46 more miles
4/10 + 37/100 = ____
77/100
True or false: 1/3 of a tiny pie COULD be smaller than 1/6 of a big pie.
True.
Use an efficient strategy to solve:
235
x 7
1,645
Complete with >, <, or =
8/6 ____ 1 and 2/6
8/6 = 1 and 2/6
Ms. Scallon wants to run 100 miles over the next few weeks. She ran 8 miles a day for 3 days. Then she ran 6 miles a day for 5 days. How many more miles does she have to run to reach her goal?
Is 70 more miles a reasonable estimate for this answer? Why or why not?
No
Example answer: If she still had to run 70 miles to reach her goal that would mean she only ran 30 miles. And 8x3 already gets you very close to 30 before even adding 6x5.
Complete both:
9/8 = ____ x 1/8
5/12 = 5 x ____
9
1/12
Complete both with <, >, or =
0.7 ____ 0.89
0.60 ____ 0.06
0.7 < 0.89
0.60 > 0.06
Use an efficient strategy to solve:
26
x32
832
True or false:
4 x 2/3 is the same as 8 x 1/3
Explain your thinking.
True
Example: 4 x 2/3 = 8/3
8 x 1/3 = 8/3
Ms. Scallon wants to run 100 miles over the next few weeks. She ran 8 miles a day for 3 days. Then she ran 6 miles a day for 5 days. How many more miles does she have to run to reach her goal?
Write an equation for this problem with a letter standing for the unknown quantity.
(8x3) + (6x5) + m = 100
Complete both.
90/100 = ___/10
85/100 = 0.___
9/10
0.85
Which is greater, 2/8 or 1/3? How do you know?
1/3 is greater.
Example: 2/8 is the same as 1/4. 1/4 is less than 1/3 because fourths are smaller than thirds.
Use an efficient strategy to solve:
288 / 9 = ____
32
Heysha's pet snail moved 9 and 3/8 cm. Manuel's snail moved 7 and 7/8cm. How much farther did Heysha's snail move than Manuel's?
1 and 4/8 cm
or
1 and 1/2 cm
6 people each ate 3/8 of a pizza. How much pizza did all 6 people eat together?
18/8 or
2 and 2/8 of a pizza
Kia has 0.3 meters of ribbon. Ariel has 0.3 decimeters of ribbon. Do they have the same amount? How do you know?
No
Example: because 1 decimeter is 1/10 of a meter. So 0.3 decimeters would be a lot smaller than 0.3 meters.
Rewrite 2/3 and 3/4 with a common denominator.
2/3 = 8/12
3/4 = 9/12