Cemerlang Mathematics UPSR
3.0 DECIMALS
3. 1 Convert decimal to a fraction of tenths, hundredths and thousandths.
No Fraction of tenths,hundredths,
Decimal
thousandths
1 0.2
2 0.04
3 1.6
4 3.081
5 8.14
6 0.008
7 2.09
8 4.432
9 3.25
10 3.006
11 5.701
12 8.001
13 1.02
14 0.05
15 3.917
16 0.132
17 3.03
18 4.019
19 8.808
20 0.003
61
Cemerlang Mathematics UPSR
3.1. Convert fraction of tenths, hundredths, thousandths to a decimal
No
Value Decimal
1
1 100
1
2 1000
3
3
10
3
4 100
3
5
100
7
6 4
10
7
7 7
100
7
8 9
1000
11
2
9 10
11
10 6
100
11
11 7
1000
1
12 2
10
1
13 2
100
62
Cemerlang Mathematics UPSR
3.1.1 Convert decimal to decimals of tenths, hundredths and thousandths.
No. Question 1 decimal place 2 decimal places 3 decimal places
Exp
1.23465 1.2 1.23 1.235
1 0.09876
2 12.2345
3 11.9876
4 9.075630
5 12.09542
6 0.087642
7 0.12647
8 0.16482
9 11.20856
10 21.0897
11
32.0987
45.6547
12
65.8769
13
12.5432
14
56.9076
15
63
Cemerlang Mathematics UPSR
3.2 Add whole number or decimal with decimal up to 3 decimal places.
1 23.945 + 6.37 = 2. 76.545 + 23.8 =
3 6.054 + 27 = 4. 76.4 + 8 =
5. 5.68 + 12.386 = 6. 76.123 + 8.2 =
7. 27.006 + 20 = 8. 6 + 1.23 =
64
Cemerlang Mathematics UPSR
9. 23 + 6.374 = 10. 76.76 + 23.824 =
11 21.293 + 3.15 = 12. 76 .46 + 8.2 =
13. 15.5 + 12.386 = 14. 23.98 + 8.209 =
15 9.3 + 71.893 = 16 25 + 7 .345 =
65
Cemerlang Mathematics UPSR
3.3 Subtract decimal from decimal or whole number.
1 3.945 – 0.37 = 2. 76.545 – 23.8 =
3 65.01 – 27.07 = 4. 23.41 – 8.546 =
5. 45.68 – 12.386 = 6. 76.01 – 8.2 =
7. 27.006 – 18.51 = 8. 60.016 – 10.23 =
66
Cemerlang Mathematics UPSR
9. 23 – 6.374 = 10. 76 – 23.824 =
11 21.2 – 3.158 = 12. 45 – 8.274 =
13. 15.5 – 12.386 = 14. 23.9 – 8.209 =
15 95 – 71.893 = 16 251 – 7 .345 =
67
Cemerlang Mathematics UPSR
3.4 Multiply decimal less than 10 with 1 digit
1. 3.405 × 3 = 2. 6.54 × 5 =
3 1.054 × 4 = 4. 6.503 × 7 =
5. 5.68 × 9 = 6. 6.023 × 6 =
7. 5.09 x 7 8. 6.543 x 5
68
Cemerlang Mathematics UPSR
9. 1.709 × 3 = 10. 7.935 × 7 =
11. 1.054 × 4 = 12. 6.503 × 7 =
13. 8.876 × 4 = 14. 6 x 5.023 =
15. 8 x 0.864 16. 7 x 5.543
69
Cemerlang Mathematics UPSR
3.4 Divide decimal less than 10 .
1. 3.015 ÷ 5 = 2. 6.51 ÷ 3 =
3 1.05 ÷ 5 = 4. 6.307 ÷ 7 =
5. 9.36 ÷ 8 = 6. 6.048 ÷ 9 =
7. 3.245 ÷ 5 8. 1.014 ÷ 6
70
Cemerlang Mathematics UPSR
9. 2.709 ÷ 3 = 10. 4.932 ÷ 9 =
11. 7.05 ÷ 5 = 12. 6.013 ÷ 7 =
13. 2.504 ÷ 8 = 14. 4.536 ÷ 6 =
15. 9.304 ÷ 4 16. 7 .218 ÷ 9
71
Cemerlang Mathematics UPSR
Mixed Operation : Involving +, - and bracket.
Example 23.45 — 17.634 + 45 = 1. 76 — 34.76 + 23.876 =
Solve from the left
23 . 450
- 17 . 634
5 . 816
+ 45 . 000
50 . 816
2. ( 76.5 + 123.987 ) — 189.72 = 3. 36.67 — ( 17.89 + 18 ) =
4. ( 55 — 34.987 ) + 12.88 = 5. 44.9 + 57 — 99.023 =
6. 67 + 34.78 — 24.009 = 7. 74.9 — 33.276 + 41.624 =
72
Cemerlang Mathematics UPSR
Add and subtract involving fractions of tenths, hundredths and thousandths
No. Question Convert fraction to decimal Answer
1.9
9 71 9 71 + 2.71
Exp 1 + 2 1 = 1.9 , 2 = 2.71
10 100 10 100 4.61
7 31
2 + 2
1 10 100
713 71
3 + 2
2 1000 100
97
2 + 3 .3
3 100
3
4.003 + 3
4 10
7
2 + 0.077
5 1000
17
5.1 — 4
6 100
5
7 6 — 2.045
10
8
8 7.9 — 1
100
8
9 6 — 0.078
1000
152
10 5.01 — 1
1000
73
Cemerlang Mathematics UPSR
Basic operation of decimals : State the answer in extended notation.
Example 23.945 + 6.37 = 1. 76.545 — 23.8 =
23.945
+ 6.370
30.315
Extended Notation = 30 + 0.3 + 0.01 + 0.005
2 6.054 × 27 = 3. 76.4 ÷ 8 =
4. 5.68 + 12.386 = 5. 76.123 — 8.2 =
6. 27.006 × 20 = 7. 1.23 ÷ 6 =
74
Cemerlang Mathematics UPSR
Basic operation of decimals : State the answer to 1 decimal place.
Example 23 ― 6.374 = 1. 76.76 + 23.824 =
23.000
― 6.374
16.626
1 decimal place = 16.6
2 21.293 × 5 = 3. 76 .46 ÷ 8 =
4. 15.5 ― 12.386 = 5. 23.98 + 8.209 =
6 71.893 × 9 = 7 20.755 ÷ 7 =
75
Cemerlang Mathematics UPSR
Multiply decimal with whole number up to 2 decimal places.
State the answer to the nearest tens.
1. 23.405 × 37 = 2. 6.54 × 18 =
23 . 407
× 37
163 849
702 210
866 .059
Round off to the nearest tens = 870
3 1.054 × 39 = 4. 6.503 × 47 =
5. 5.68 × 12 = 6. 6.023 × 31 =
76
Cemerlang Mathematics UPSR
Mixed Operation : Involving +, - and bracket.
Example 23.45 — 17.634 + 45 = 1. 76 — 34.76 + 23.876 =
Solve from the left
23 . 450
- 17 . 634
5 . 816
+ 45 . 000
50 . 816
2. ( 76.5 + 123.987 ) — 189.72 = 3. 36.67 — ( 17.89 + 18 ) =
4. ( 55 — 34.987 ) + 12.88 = 5. 44.9 + 57 — 99.023 =
6. 67 + 34.78 — 24.009 = 7. 74.9 — 33.276 + 41.624 =
77