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[Front]

Calculations involving money should be given to ___ decimal places to represent the pence.

[Back]

two

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Maths, Approximation - Leaderboard

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Maths, Approximation - Details

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1) Chapter 1 View

Questions:

20 questions

🇬🇧		🇬🇧

Calculations involving money should be given to ___ decimal places to represent the pence.

Two

Look at the _____ digit after the decimal point if rounding to one decimal place or the second digit for ___ decimal places.

First, two

If the digit after the vertical line is 4 or less, ____ the previous digit the ____.

Keep, same

If the digit after the vertical line is 5 or more, _______ the previous digit by ___.

Increase, one

Draw a vertical line to the right of the _____ _____ digit that is required.

Place value

After rounding, remove any numbers to the _____ of the vertical line.

Right

When rounding to one significant ______, draw a vertical line to the right of the _____ digit in the number. Turn every number after the vertical line into a ____. Do the same when rounding to two significant figures, but do it after the ______ digit in the ______.

Figure, first, zero, second, number

If the number you are rounding to a significant figure is a decimal, look at the first _________ digit in the number, draw a vertical line to the right of it and if it's a number after the decimal point, ______ the numbers after the vertical line.

Non-zero, remove

How do you estimate a calculation?

By rounding the numbers in the question before performing the calculation

Usually when estimating a calculation, numbers are rounded to ___ significant figure. The 'approximately equal to' sign, ≈, is used to show that values have been _______.

One, rounded

Estimate the value of 23 x 67.

1400

Estimate the value of (58.4 / 2.79) - 9.8.

Estimate (68.7 - 9.9) / (2.77).

If a kitchen unit is 600 mm wide to the nearest 10 mm, it could actually be any width from ___ mm up to ___ mm – so it might not fit into a gap that is exactly 600 mm wide. To describe all the possible values that a rounded number could be, we use ______ __ ________.

595, 605, limits of accuracy

A quick way to calculate upper and lower bands is to _____ the degree of accuracy specified, then add this to the rounded value for the _____ limit and ________ it from the rounded value for the _____ limit.

Halve, upper, subtract, lower

If a value is rounded, its upper or lower bound as appropriate should be used when finding the _______ or ________ possible answers to a calculation.

Largest, smallest

A bag of flour has a mass of 1500 g (to the nearest 10 g). Find the upper bound for the mass of 10 bags of flour.

15050g

Jack is 1.8 m tall (rounded to the nearest 10 cm). Ella is 1.63 m tall (rounded to the nearest cm). What is the smallest possible difference in their heights?

11.5cm

A piece of A4 paper is 21.1 cm by 29.7 cm measured to the nearest 0.1 cm. What are the lower and upper bounds of its area, in square centimetres, to 1 dp?

624.1cm squared to

A piece of A4 paper is 21.1 cm by 29.7 cm measured to the nearest 0.1 cm. What are the lower and upper bounds of its area, in square centimetres, to 1 dp?

624.1cm squared to 629.2cm squared