Sample of Gr. 12 Notes
| 1.2 |
Checking on your skills.
– AS 12.1.1, 12.1.2 |
| |
This exercise is aimed at refreshing your memory and checking
on your skills. If you have problems with any of these examples,
check the corresponding work in Grade 10 and Grade 11 and ask
your teacher to give you more examples. |
| |
|
| |
|
| Exercise 1.2 |
| 2. |
Convert the following decimal fractions into common vulgar
fractions in simplest form: |
| 2.1 |
| 0,7 |
2.2 0,45 |
2.3 0,406 |
2.4 0,00201 |
2.5 0,666 |
2.6 0,0136 |
|
| |
|
| 3. |
Write the following decimal fractions as percentages: |
| 3.1 |
| 0,56 |
3.2 0,74 |
3.3 0,08 |
3.4 0,95 |
3.5 1,20 |
3.6 2,68 |
|
| |
|
| 4. |
Write the following percentages as decimals: |
| 4.1 |
| 25% |
4.2 48% |
4.3 18% |
4.4 42,6% |
4.5 83,78% |
4.6 125% |
|
| |
|
| 5. |
Determine the following: |
| 5.1 |
25% of R2 000
5.2 36% of 3,750 m
|
| 5.3 |
84% of 2,35
5.4 40% of 280 marks |
| |
|
| 6. |
Write each of the following as a ratio in its simplest form: |
| 6.1 |
R20 : R840
6.2 35 mm : 680 mm |
| 6.3 |
14 marbles : 49 marbles
6.4 22 years :
64 years |
| |
|
| 7.1 |
Divide R3 000 between A and B in the ratio of 2:5. How much does each
one get? |
| 7.2 |
Divide 36 marbles between A, B and C in the ratio of 1 : 3 : 5 |
| |
|
| 8.1 |
A salesman gives you a discount of 15% on a sale of R3 600.
How much will you pay? |
| 8.2 |
Two calculators cost R164. The salesman will give you a
discount of 10% if you buy more |
| |
than 20 calculators. What will you pay for 21 calculators? |