Mental Math
560 ÷ 80
What is 7?
Estimate 804 ÷ 12 using compatible numbers. State what each compatible number is as well.
What is 800 ÷ 10 = 80?
Solve 736 x 23
Answer: 16,928
Solve 544 ÷ 27
What is 20R4
A tropical storm has been moving at 15 miles per hour for the past two days. Bess recorded that the storm moved 135 miles yesterday and 75 miles today. For how many hours has Bess been keeping track of the storm? Write and solve equations.
135 + 75 = 210 miles
210 ÷ 15 = 14 hours
6,300 ÷ 90
What is 70?
Estimate 434 ÷ 37 using compatible numbers. State what each compatible number is as well.
What is 400 ÷ 40 = 10?
Solve 688 X 43
Answer: 29,584
Solve 867 ÷ 68
What is 12 R 51?
A parking garage has 6 levels. Each level has 15 rows. There are 2,250 parking spaces in all. How many parking spaces are in each row? Write and solve equations to find the answer.
2,250 total spaces ÷ 6 levels = 375 spaces per level
375 spaces per row ÷ 15 rows = 25 spaces per row
or
15 rows x 6 levels = 90 rows total
2250 total spaces ÷ 90 rows = 25 spaces per row
1,600 ÷ 80
What is 20?
Estimate 792 ÷ 35 using compatible numbers. State what each compatible number is as well.
What is 800 ÷ 40 = 20?
362 x 756
Answer: 273,672
Solve 332 ÷ 29
What is 11 R 13?
An adult lion can eat a lot of meat in one sitting. A pride of lions eats a water buffalo that has 1,182 pounds of meat and each adult lion eats 66 pounds of meat. How many adult lions will the water buffalo feed?
17 adult lions
48,000 ÷ 80
What is 600?
Estimate 1,036 ÷ 21 using compatible numbers. State what each compatible number is as well.
What is 1,000 ÷ 20 = 50?
Solve 840 x 285
Answer: 239,400
Solve 8,899 ÷ 61
What is 145 R 54?
There are 720 students at a school. All the students at the school are going on a field trip to a science museum. The students will ride school buses to the museum. Each bus holds 60 students when completely full.
Part 1: What is the least number of buses needed to take all the students from the school to the science museum? Show or explain how you got your answer.
Part 2: The school can also use smaller buses to take the students to the museum. Each smaller bus holds 50 students when completely full. What is the least number of smaller buses needed to take all the students from the school to the science museum? Show or explain how you got your answer.
Part 1: 12 buses
Part 2: 15 small buses
A carton of staples has 60 packages. The carton contains 36,000 staples in all. Find the number of staples in each package.
What is 600 staples?
Josh's band wants to learn a new song for the school concert in 6 weeks, 42 days. The song has 2,024 lines. Find about how many lines they need to learn each day to learn the song in time.
What is 2,000 ÷ 40 = 50?
Solve 755 x 11 and check your answer using division.
Answer: 8305
Solve 1,699 ÷ 17
What is 99 R 16?
Frances is sewing a border around 2 rectangular tablecloths that each measure 9 feet long by 6 feet wide. If it takes her 3 minutes to sew on 1 inch of border, how many minutes will it take her to complete her sewing project?
2, 160 minutes