Topic Decimal Numbers printable pdf download

Topic Decimal Numbers

Decimal Numbers

Strand:

Number

Strand unit:

Decimals

404

Identify place value of whole numbers and decimals to 2 places.

424

Express tenths and hundredths as fractions and decimals.

425

Identify place value of whole numbers and decimals to 2 places and write in

expanded form.

426

Order decimals on the number line.

Looking back: What the 3rd class programme covered

Writing tenths in decimal form.

Ordering decimals (0 . 1, 0 . 2, 0 . 3, etc.) on a number line.

Maths skills used in this topic

1. Applying and problem-solving:

Apply mathematical concepts and processes, and plan and

implement solutions to problems, in a variety of contexts.

2. Reasoning:

Reason, investigate and hypothesise with patterns and relationships in mathematics.

100 square (10 x 10), number line, abacus

Vocabulary

Hundredth, expand, necessary, unnecessary

Teaching points

Importance of place value:

Just as 79 and 709 have different values, so too 0 . 07 and 0 . 7.

In which number has 8 the greater value: 0 . 83 or 0 . 98? Some children might

incorrectly choose 0 . 98 because this number is greater than 0 . 83.

Unnecessary zeroes: With whole numbers, a zero preceding non-zero numerals is unnecessary

(08 = 8). These might be termed leading zeroes. With decimals the opposite is true (0 . 80 =

0 . 8). These might be termed trailing zeroes.

Note: While trailing zeroes are not strictly necessary in decimals, they are sometimes required

by convention. For example with money, 6 euro and 30 cent will be written as €6 . 30 (and not

as €6 . 3). Furthermore in 5th class and later, the student may be asked to round a number

such as 73 . 402 to 2 decimal places. The correct answer would be 73 . 40 (and not 73 . 4).

Topic Decimal Numbers