30157

Question

{{1}} ×\times {{2}} = ?

After rounding both numbers to the nearest 10, which of the following is the best estimate of this equation?

Worked Solution

Rounding to the nearest 10:

{{1}} →\to {{3}}

{{2}} →\to {{4}}

Using long multiplication:

{{solution}}

Variant 0

DifficultyLevel

586

Question

162 ×\times 205 = ?

After rounding both numbers to the nearest 10, which of the following is the best estimate of this equation?

Worked Solution

Rounding to the nearest 10:

162 →\to 160

205 →\to 210

Using long multiplication:

       160×    210————  160032000————–33600\begin{array}{ccccccccccc} \ \ \ \ \ \ \ {160} \times \\ \ \ \ \ \underset{\text{------------}}{210} \\ \ \ {1600} \\ \underset{\text{--------------}}{32000} \\ {33600} \\ \end{array}

Question Type

Multiple Choice (One Answer)

Variables

Variable nameVariable value
1
162
2
205
3
160
4
210
solution
$\begin{array}{ccccccccccc} \ \ \ \ \ \ \ {160} \times \\ \ \ \ \ \underset{\text{------------}}{210} \\ \ \ {1600} \\ \underset{\text{--------------}}{32000} \\ {33600} \\ \end{array}$
correctAnswer
33 600

Answers

Is Correct?Answer
x

32 000

x

32 850

x

33 210

✓

33 600

Variant 1

DifficultyLevel

586

Question

195 ×\times 144 = ?

After rounding both numbers to the nearest 10, which of the following is the best estimate of this equation?

Worked Solution

Rounding to the nearest 10:

195 →\to 200

144 →\to 140

Using long multiplication:

       200×    140————  800020000————– 28000\begin{array}{ccccccccccc} \ \ \ \ \ \ \ {200} \times \\ \ \ \ \ \underset{\text{------------}}{140} \\ \ \ {8000} \\ \underset{\text{--------------}}{20000} \\ \ {28000} \\ \end{array}

Question Type

Multiple Choice (One Answer)

Variables

Variable nameVariable value
1
195
2
144
3
200
4
140
solution
$\begin{array}{ccccccccccc} \ \ \ \ \ \ \ {200} \times \\ \ \ \ \ \underset{\text{------------}}{140} \\ \ \ {8000} \\ \underset{\text{--------------}}{20000} \\ \ {28000} \\ \end{array}$
correctAnswer
28 000

Answers

Is Correct?Answer
x

26 600

x

27 500

✓

28 000

x

28 080

Variant 2

DifficultyLevel

586

Question

232 ×\times 155 = ?

After rounding both numbers to the nearest 10, which of the following is the best estimate of this equation?

Worked Solution

Rounding to the nearest 10:

232 →\to 230

155 →\to 160

Using long multiplication:

       230×    160———— 1380023000————–36800\begin{array}{ccccccccccc} \ \ \ \ \ \ \ {230} \times \\ \ \ \ \ \underset{\text{------------}}{160} \\ \ {13800} \\ \underset{\text{--------------}}{23000} \\ {36800} \\ \end{array}

Question Type

Multiple Choice (One Answer)

Variables

Variable nameVariable value
1
232
2
155
3
230
4
160
solution
$\begin{array}{ccccccccccc} \ \ \ \ \ \ \ {230} \times \\ \ \ \ \ \underset{\text{------------}}{160} \\ \ {13800} \\ \underset{\text{--------------}}{23000} \\ {36800} \\ \end{array}$
correctAnswer
36 800

Answers

Is Correct?Answer
x

34 500

x

34 810

x

35 960

✓

36 800

Variant 3

DifficultyLevel

586

Question

424 ×\times 115 = ?

After rounding both numbers to the nearest 10, which of the following is the best estimate of this equation?

Worked Solution

Rounding to the nearest 10:

424 →\to 420

115 →\to 120

Using long multiplication:

       420×    120————  840042000————– 50400\begin{array}{ccccccccccc} \ \ \ \ \ \ \ {420} \times \\ \ \ \ \ \underset{\text{------------}}{120} \\ \ \ {8400} \\ \underset{\text{--------------}}{42000} \\ \ {50400} \\ \end{array}

Question Type

Multiple Choice (One Answer)

Variables

Variable nameVariable value
1
424
2
115
3
420
4
120
solution
$\begin{array}{ccccccccccc} \ \ \ \ \ \ \ {420} \times \\ \ \ \ \ \underset{\text{------------}}{120} \\ \ \ {8400} \\ \underset{\text{--------------}}{42000} \\ \ {50400} \\ \end{array}$
correctAnswer
50 400

Answers

Is Correct?Answer
✓

50 400

x

49 240

x

48 760

x

46 200

Variant 4

DifficultyLevel

586

Question

565 ×\times 123 = ?

After rounding both numbers to the nearest 10, which of the following is the best estimate of this equation?

Worked Solution

Rounding to the nearest 10:

565 →\to 570

123 →\to 120

Using long multiplication:

       570×    120———— 1140057000————–68400\begin{array}{ccccccccccc} \ \ \ \ \ \ \ {570} \times \\ \ \ \ \ \underset{\text{------------}}{120} \\ \ {11400} \\ \underset{\text{--------------}}{57000} \\ {68400} \\ \end{array}

Question Type

Multiple Choice (One Answer)

Variables

Variable nameVariable value
1
565
2
123
3
570
4
120
solution
$\begin{array}{ccccccccccc} \ \ \ \ \ \ \ {570} \times \\ \ \ \ \ \underset{\text{------------}}{120} \\ \ {11400} \\ \underset{\text{--------------}}{57000} \\ {68400} \\ \end{array}$
correctAnswer
68 400

Answers

Is Correct?Answer
x

67 200

x

67 805

✓

68 400

x

69 495

Tags

  • nap_nc