Rounding from a calculator: Approximating

Rounding from a calculator: Approximating

Lesson details

Key learning points

  1. In this lesson, we will learn about approximation and how to use that to approximate answers to calculations.

Licence

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5 Questions

Q1.
What is 234.8 to the nearest integer?
230
234
Correct answer: 235
240
Q2.
Round 152.8 to the nearest 10
Correct answer: 150
152.0
153
160
Q3.
Round 9.064 to 2 decimal places
9.05
Correct answer: 9.06
9.10
9.60
Q4.
Round 18.961 to 1 decimal place
18
18.0
18.9
Correct answer: 19.0
Q5.
Round 7846.7 to the nearest 100
Correct answer: 7800
7847
7850
7900

6 Questions

Q1.
What does this symbol mean? ≈
Correct answer: Approximately equal to
Closely linked to
Equal to
Not equal to
Q2.
Find an approximation for:
18
Correct answer: 25
27
27.3
Q3.
A student is thinking of an approximate value for √(67 ). What should her answer be?
2√(17) because that is the answer my calculator gives
Correct answer: 8 because √(64) is 8
8.24 because that is the exact answer to 2 d.p.
9 because 67 is closer to 70
Q4.
Find an approximation for:
Correct answer: 10
10.5
15
22.5
Q5.
Find an approximation for:
25
44
55.7
Correct answer: 60
Q6.
Why is the approximation to this calculation greater than the actual answer?
Carlos approximate answer is wrong.
Carlos rounded down when he was approximating
Correct answer: Carlos rounded up for when approximating

Lesson appears in

UnitMaths / Accuracy and estimation