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Decimals
Objectives
To understand that any digit to the right of a decimal point is only part of a whole number and to understand tenths and hundredths of a number.
Resources
Abacus 4 Textbooks 2 & 3 | Squared paper
Today's Lesson
Main Activity
Turn to page 89 in Abacus 4 textbook 2 and ask your student to complete the division calculations as the mental warm-up for this lesson. Your student may well need to write the calculations down when three digit numbers are being divided, but the two digit numbers should be able to be completed orally.
Turn to page 13 in Abacus 4 Textbook 3.
Point out that the digits to the immediate right of a decimal point represent tenths of a whole number.
The digit two places to the right of a decimal represents hundredths. Use 'Decimal Place Value' to recap if unsure.
This is best explained in terms of English money. In this system, there are 100 pence or 100p in one pound, or £1.00.
So, for example, 20p is 2 tenths of a full pound and is written as a decimal as £0.20. 3p is 3 hundredths of a full pound, and is written as £0.03.
Your student has had quite a bit of experience with decimals by now, and should be able to cope with the instructions on the page without too much difficulty.
Watch 'Ordering Decimal Numbers' if needed.
Ask your student to copy and complete the page.