Tutorial
In Course: GCSE Mathematics: Lower Tier

GCSE Maths: Rounding, Estimating and Bounds

Learn to round numbers to a given number of decimal places or significant figures. Use rounding to estimate the answer to a calculation and understand the concept of error intervals (upper and lower bounds).
GCSE Maths: Rounding, Estimating and Bounds

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Deck Contents

34 Cards
Lesson#1
Welcome to this deck on rounding, estimating and bounds. You'll learn how to round numbers accurately to decimal places and significant figures. We'll then use rounding to estimate the answers to calculations, and finally, we'll explore the idea of error intervals, also known as upper and lower bounds.
Lesson#2
Let's start with rounding to a set number of decimal places. The rule is simple: find the digit in the place you're rounding to, then look at the very next digit to its right. If that next digit is 5 or more, you round the previous digit up. If it's 4 or less, you leave the previous digit as it is.
Quiz#3
When rounding a number, what is the rule for the deciding digit?

5 or more, round up

Quiz#4
To round a number to two decimal places, which digit do you look at to make your decision?

the third decimal place

Quiz#5
What is the number 8.46 rounded to one decimal place?

8.5

Quiz#6
What is the number 2.913 rounded to two decimal places?

2.91

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