Page 4 - Syok Praktis PBD (2023) Mathematics TH4

Mathematics Year 4 Practice 2 Fractions, Decimals and Percentages

5. Subtraction of fraction, whole number and 8. Addition of decimals.
mixed numbers with a common denominator Example: 0.2 + 0.41 =
or different denominators.
0
Example: 4 1 5 . 2 0 Add 0 for easy
1 + + = 1 + 0 . 4 1 calculation.
1 3 5 3 4 4 4
2— – — = 1— – — 0 . 6 1
4 4 4 4 Decimal point must
2
1
= 1— = 1 — be on a straight line.
4 2
Operation is executed
Example: from right to left.
5
2
2
5
9
9 – 2— – 1 — = 8— – 2 — – 1 —
9 3 9 9 3
4 2 × 3 Example: 0.326 + 5.8 + 0.09 =
= 6— – 1——–
9 3 × 3 1 1
0
13 6 . 3 2 6
= 5— – 1 — Add two 0s for
9 9 5 . 8 0 0 easy calculation.
7
= 4— + 0 . 0 9 0
9
6 . 2 1 6
6. Addition and subtraction of fraction, whole
number and mixed numbers.
Example: 9. Subtraction of decimals.
1 1 1 1 Example: 3.7 – 0.4 =
1— + 2 – 1 — = 3— – 1 —
4 5 4 5 . 7
3
1 × 5 1 × 4 – 0 . 4
= 3——– – 1——–
4 × 5 5 × 4 3 . 3 Decimal point
5
1
4
= 3— – 1 — = 2 — must be on a
20 20 20 straight line.
Example: Operation is executed
3 1 1 3 1 × 2 1 × 4 from right to left.
3— – — + 2 — = 3— – ——– + 2——–
8 4 2 8 4 × 2 2 × 4
3 2 4 Example: 9.312 – 2.7 – 4.165 =
= 3— – — + 2 —
8 8 8
8 13 5 10 12
1
4
5
9
6
= 3— + 2 — = 5 — . 3 1 2 . 6 1 2
8 8 8 – 2 . 7 0 0 – 4 . 1 6 5
7. Proper fraction and mixed numbers from a 6 . 6 1 2 2 . 4 4 7
certain quantity.
Example: Add two 0s for easy
‘of’ means calculation.
1 1 2 multiply
— of 10 = — × 10 10. Multiplication of decimals.
5 5 1
= 2 Example: 3.2 × 4 =
3 . 2 1 decimal place.
Example: × 4
1 9 100 1 2 . 8 Product also in 1 decimal place.
2— of 400 = — × 400
4 4
= 9 × 100 = 900
13 © Penerbitan Pelangi Sdn. Bhd.

02 SYOK! Praktis PBD Maths Y4.indd 13 13/10/2022 2:42 PM

`daripada’ bermaksud darab