Measures, Money And Accuracy
Overview
A recipe scaled from four servings to eleven, a currency converted for a holiday budget, a bridge span measured to the nearest centimetre: every real measurement or amount of money needs a consistent set of units and an honest statement of how precise it really is.
This topic ties together unit conversions, money calculations, the four ways of writing the same proportion (fraction, decimal, percentage, ratio), rounding to a given accuracy, the upper and lower bounds that a rounded measurement could hide, and standard form for very large or very small numbers.
Objectives
- Carry out calculations using standard units of mass, length, area, volume and capacity, time and average speed using metric and SI units
- Carry out calculations using money, including converting between currencies
- Interchange fractions, decimals, ratios, proportions and percentages, selecting the most appropriate to given situations
- Use the four operations with fractions and decimals, and use percentages, ratio and proportion in problems
- Express numbers to a given degree of accuracy including a given number of decimal places or significant figures
- Solve problems using upper and lower bounds where values are given to a degree of accuracy
- Use and solve problems involving numbers in standard form
Mind map
This topic is mapped out so you can see how the ideas connect.
Open the mind map in the app
Flashcards
Quick recall practice on the facts this topic is tested on.
Practise these cards in the app
Lesson Note
Complete Note Available on the Green Bridge App
Get the Green Bridge CBT app on your phone or computer for the complete IGCSE library: past papers, mark schemes, mind maps, flashcards and audio lessons.
Lesson Evaluation
Congratulations on completing the lesson on Measures, Money And Accuracy. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- How many square centimetres are there in 2 square metres? A) 200 B) 2000 C) 20000 D) 200000 Answer: C
- A car travels 150 km in 2 hours. What is its average speed in km/h? A) 60 B) 75 C) 150 D) 300 Answer: B
- Which fraction is equivalent to 45%? A) 4/5 B) 9/20 C) 9/2 D) 4/9 Answer: B
- A length is recorded as 8.0 cm to 1 decimal place. What is the lower bound? A) 7.5 cm B) 7.9 cm C) 7.95 cm D) 8.05 cm Answer: C
- Which of these is 0.0000672 written in standard form? A) 6.72 x 10^5 B) 6.72 x 10^-5 C) 672 x 10^-8 D) 6.72 x 10^-4 Answer: B
Work through these questions in the app
Work through these questions in the app
Recommended Books
Practice Mock Questions
Want to practice mock questions on Measures, Money And Accuracy? Download the Green Bridge CBT app to access mock questions and full practice assessments for this topic.
Download The App On Google Playstore
Everything you need to excel in your exams
