Vocabulary
The operation that uses repeated addition to combine equal groups.
multiplication
25 x 25
625
123 x 25
3,075
Estimate 178 x 24
200 x 20= 4,000
A banana contains 105 calories. Last week, Angelia and Sophia ate a total of 14 bananas. How many calories does this represent?
105 x 14= 1,470 bananas (THAT IS A LOT OF BANANAS!!!)
The answer to a multiplication equation is called a _________.
product
59 x 63
3,717
523 x 55
28,765
Estimate 369 x 45
400 x 50 = 20,000
The latest mystery novel costs $24. If the store sells 157 novels how much money did they make?
157 x $24= $3,768
The numbers you multiply together are called ______.
factors
79 x 88
6,952
624 x 67
41,808
Is this estimation reasonable for 789 x 24? Why?
700 x 20= 14,000
Unreasonable... because 789 is closer to 800 than 700.
Dr. Rodriguez works 178 hours each month. How many hours does she work in a year?
1278 x 12= 15,336
______ gets you an approximate answer that helps you determine if your product is reasonable or unreasonable.
Estimating
86 x 66
5,676
2,456 x 32
78,592
At a warehouse, 127 delivery trucks were loaded with 48 packages on each truck. Estimate the total number of packages on the truck.
100 x 50= 5,000
There are 36 large fish tanks at the zoo. Each tank hldds 1,205 gallons of water. How many gallons of water would it take to fill all the tanks?
1,205 x 36 =43,380
When estimating, I can _____ both numbers to get an approximate answer.
round
97 x 86
8,342
6,789 x 87
590,643
Is 60,000 an over or underestimate for 1,245 x 62?
Underestimate because both numbers were rounded down.
Maddox has 142 songs on his playlist. Grant has 11 times as many songs as Maddox. How many songs do they have altogether?
142 x 11= 1,562
1,562 + 142= 1,704 songs altogether