Vocabulary
The answer to an addition problem
Sum
90 X 10 4 =________
Explain how you found the answer.
900,000
A large egg has 78 calories. The average hen lays 250 eggs a year. How many calories would be in all the eggs a hen lays in a year?
78 X 250 = 19,500
34 X 2 = _____
68
22 X 11 = ____
242
The answer to a multiplication problem.
Product
4 X 105 = ______
How did you get your answer?
400,000
A sporting good store sells tennis balls in boxes. Each box has 4 sleeves of tennis balls. Each sleeve has 3 tennis balls. The store sold 67 boxes on Saturday and 46 boxes on Sunday. How many tennis balls did the store sell in ALL?
1,356
I added 67 and 46 which equals 113.
I multiplied 4 X 3 = 12
then I multiplied 113 x 12 which equals 1,356.
77 X 5 = ____
385
49 X 14 = ____
686
What is an overestimate?
An estimate that is larger than the actual answer.
Use rounding to estimate 189 X 14 = _____
Explain how you got your answer.
I rounded 189 to 200.
I rounded 14 to 10.
I multiplied the 1 in 10 and the 2 in 200 and got 2, then I added my zeros (3 total) and got the answer 2,000.
Final answer=2,000
The school band has 115 members. They are raising money for band camp. If each member raises $75, what is the total amount of money raised for band camp?
75 X 115 =$ 8, 625
121 X 4 = _______
484
78 X 34 = _____
2,652
What is an under estimate?
An estimate that is smaller than the the actual answer.
Use rounding to estimate 55 X 81= ________
Was your answer an overestimate or underestimate?
I rounded 55 up to 60.
I rounded 81 to 80.
I multiplied 8 x 6 = 48
I added my zeros (2 total)
Final answer=4,800
It was an overestimate, because I rounded 55 up to 60.
789 X 3 = _____
2,367
55 X 77 = _____
4,235
When you see the word "altogether" in a word problem, that is telling you to do what?
Add, subtract, multiply, divide?
Add
Use rounding to estimate 405 X 12 = ______.
Was your answer an overestimate or underestimate?
I rounded 405 to 400.
I rounded 12 down to 10.
I then multiplied 4 X 10 and got 40.
I counted my zeros and added them to 40 (3)
Final Answer=40,000
432 X 7 = ______
3,024
10 X 10= ___
100