# AN N2/L1.7

Approximate decimals by rounding to a whole number and to one or two decimal places (a) Know what is meant by decimal places

An activity using mobile phones. Students could also do a warm-up by measuring and weighing real phones (switched off)!

The lesson was designed for an E3 young learner class. The last section, using percentage changes, might suit stronger learners (L1 extension).

**Editor’s note**

Fully mapped to the Functional Maths criteria. Covers rounding whole nos. and decimals, money, percentages, fractions and area.

Learners round the same number to a several different degrees of precision. This reinforces that the important thing about rounding is what one is rounding **to**..

This spreadsheet is designed to enable students to check their own work; but also to learn about what happens when you add two decimals, or multiply two fractions, and so on.

The spreadsheet consists of the following sheets:

An L1-2 investigation that covers direct proportion (best buy), and rounding / calculating with money /decimals. Two options are included: students can either research Easter egg and chocolate prices on internet shopping sites or use those given. In both cases they must investigate the cost per 100g chocolate and work out the best buy. Final extension work includes consideration of ‘buy one get one free’ and ‘two for £…’ offers.

**Editor’s note. New update for 2016 – based on supermarket prices in February 2016**

Water content of fruits & vegetables provides interesting practice with percentages, rounding decimals and calculator use.

Multi-sensory activities pprovide a great way to practise adding, subtracting and multiplying decimals. Ideal for Motor Vehicle students and any E3-L2 learners that are interested in cars.

A budgeting activity that is ideal for teenagers and will prompt plenty of discussion on the realities of managing money. Comes with salary cards, rent cards, supplementary cards, balance sheets and extra extension sheets on percentages. With full teaching notes and ideas for further customisation.

First written for a group of teenagers with motivational and concentration difficulties due to a range for reasons including dyslexia, ADD and autism.

Rounding presentation makes clever use of number lines and animation to demonstrate rounding whole numbers (nearest 10, 100, 1000) and decimals (nearest whole number, 1 and 2 d.p.) and using significant figures. Please ensure that you also download the accompanying PDF document (see below) with useful teaching notes and ideas for adapting the PPT for your own learners.

Practical and easy way to introduce decimals: use when multiplying and dividing decimals by 10, 100. Also useful when converting metric units, rounding decimals and for a general understanding of exactly what a decimal is! One partially completed chart to complete (with examples), answer sheet and a blank chart for students to use as they wish.