Word Wall
The answer to a multiplication problem
Quotient
7 x 3=
21
2x 3 = 6
so...
2 x 30 =
2 x 30 = 60
Round to the nearest ten.
15 x 12
Round to the nearest ten.
15 ≈20
12 ≈ 10
20 x 10 ≈ 200
Sean has this many shirts after he counts four sets of fifteen shirts.
4 x 15= 60
The answer to an addition problem
Sum
2x5=
10
6 x 3 =
so....
6 x 30 =
6 x 3 = 18
so....
6 x 30 = 180
Round to the nearest ten.
32 x 25 =
32 ≈
25 ≈
? x ? ≈
Round to the nearest ten.
32 x 25 =
32 ≈ 30
25 ≈ 30
30 x 30 ≈ 900
This is how much money we will have for the trip after I collect fifteen dollars from fifty people
50 x 15 = 750
$750.00
The answer to a subtraction problem
Difference
8 x 6=
48
5 x 6 =
so....
50 x 60 =
5 x 6 = 30
so....
50 x 60 = 3,000
Round to the nearest hundred.
158 x 120 =
158 ≈
120 ≈
? x ? ≈
Round to the nearest hundred.
158 x 120 =
158 ≈ 200
120 ≈ 100
200 x 100 ≈ 20,000
This is how much Alisha will spend if she buys twenty-two computers for five hundred eighty dollars each.
22 x 580 = 12,760
Each computer costs $12,760.
Sometimes you have to ________ numbers to estimate. When you do that your answer is not exact.
Round
8 x 8 =
64
4 x 7 =
so....
4 x 700 =
4 x 7 = 28
so....
4 x 700 = 2,800
456 x 42 =
Round 456 nearest hundred.
456 ≈
Round 42 nearest ten.
42 ≈
? x ? ≈
456 x 142 =
Round 456 nearest hundred.
Round 42 nearest ten.
456 ≈ 500
42 ≈ 50
500 x 50 ≈ 20,000
Cruz buys 4 flower arrangements. Each one costs fifty- six dollars. How much does she spend
$224
What is the symbol used to show approximate answers when you estimate?
≈
9 x 9=
81
9 x 8 =
so....
900 x 800 =
9 x 8 = 72
so....
900 x 800 = 720,000
346 x 17 =
Round 346 nearest hundred.
Round 17 nearest ten.
Solve.
346 x 17 =
Round 346 nearest hundred.
Round 17 nearest ten.
346 ≈ 300
17 ≈ 20
300 x 20 ≈ 6,000
This is how much the Math and Science Club's Nashville 3-day trip will cost if each student (twenty three students) will pay seven hundred twenty dollars
23 x 720=16,560