Primary 5 Mathematics: Decimals, Percentages, Fractions, and Basic Calculations

Subject: Mathematics
Class: Primary 5

Change 70% to decimals.

Convert 45% to fractions in its lowest term.

Change ½ to percentage

Chnge 1/8 to decimal.

Round of 56.6295 to two decimal places.

Calculate the product of 6.4 and 3.9

Express ¾ as a percentage

Express 7/8 as a fraction in its lowest term.

Calculate the product of 6.4 and 3.9

Express 40% as a fraction in its lowest term.

Express 12½ % as a decimal

Given that B + 17 = 30, what is vthe value of B?

Calculate the simple interest on N5000 for 2 years at 5% per annum.

Increase N1000 by 20%

Calculate the area of the shaded part.

14cm

7cm
5cm 8cm

1. Changing Percentages:

• Change 70% to decimals: 70% = 0.70
• Convert 45% to fractions in its lowest term: 45% = 45/100 = 9/20

2. Converting Fractions and Percentages:

• Change ½ to percentage: 1/2 = 0.50 or 50%
• Express ¾ as a percentage: 3/4 = 0.75 or 75%

3. Decimals and Fractions:

• Change 1/8 to decimal: 1/8 = 0.125
• Express 7/8 as a fraction in its lowest term: 7/8 (already in lowest term)

4. Calculations:

• Round off 56.6295 to two decimal places: 56.6295 ≈ 56.63
• Calculate the product of 6.4 and 3.9: 6.4 * 3.9 = 24.96

5. More Percentages and Decimals:

• Express 40% as a fraction in its lowest term: 40% = 40/100 = 2/5
• Express 12½ % as a decimal: 12.5% = 0.125

6. Simple Equations and Interest:

• Given B + 17 = 30, B = 30 – 17 = 13
• Calculate the simple interest on N5000 for 2 years at 5% per annum: Interest = Principal * Rate * Time = 5000 * 0.05 * 2 = N500

7. Area Calculation:

• Calculate the area of the shaded part: Area = (Area of rectangle) – (Area of triangle) Area = (7 * 5) – (1/2 * 5 * 8) = 35 – 20 = 15 cm²

Note: In this list, we covered various topics including converting between decimals, fractions, and percentages, basic calculations, solving simple equations, calculating interest, and finding area.

Primary 5 Mathematics:

1. How do I convert percentages to decimals?
   • To convert percentages to decimals, divide the percentage by 100. For example, 70% = 70/100 = 0.70.
2. What is the lowest term for 45% expressed as a fraction?
   • The lowest term for 45% as a fraction is 9/20.
3. How do I convert fractions to percentages?
   • To convert fractions to percentages, divide the numerator by the denominator and then multiply by 100. For example, 1/2 = 0.5 * 100 = 50%.
4. What is the decimal form of 1/8?
   • The decimal form of 1/8 is 0.125.
5. How do I round off a number like 56.6295 to two decimal places?
   • Round off 56.6295 to two decimal places gives 56.63.
6. What is the product of 6.4 and 3.9?
   • The product of 6.4 and 3.9 is 24.96.
7. How do I express 3/4 as a percentage?
   • Expressing 3/4 as a percentage gives 75%.
8. What is the lowest term for the fraction 7/8?
   • 7/8 is already in its lowest term.
9. What fraction is equivalent to 40% in its lowest term?
   • 40% is equivalent to 2/5 in its lowest term.
10. How do I calculate simple interest?
    • Simple interest is calculated using the formula: Interest = Principal * Rate * Time. For example, the simple interest on N5000 for 2 years at 5% per annum is N500.

Evaluation :

1. Change 70% to _______________. a) 0.7 b) 70 c) 0.07 d) 7
2. Convert 45% to a fraction in its lowest term: _______________. a) 4/9 b) 9/20 c) 45/100 d) 45/50
3. Change 1/8 to a decimal: _______________. a) 0.18 b) 0.12 c) 0.125 d) 0.025
4. Round off 56.6295 to two decimal places: _______________. a) 56.60 b) 56.62 c) 56.63 d) 56.65
5. Calculate the product of 6.4 and 3.9: _______________. a) 24.96 b) 36.5 c) 16.5 d) 23.7
6. Express 3/4 as a percentage: _______________. a) 75% b) 25% c) 50% d) 30%
7. Express 7/8 as a fraction in its lowest term: _______________. a) 7/8 b) 14/16 c) 21/24 d) 14/18
8. Express 40% as a fraction in its lowest term: _______________. a) 4/10 b) 4/5 c) 40/100 d) 2/5
9. Express 12½% as a decimal: _______________. a) 0.125 b) 0.0125 c) 1.25 d) 0.25
10. Given that B + 17 = 30, what is the value of B? a) 10 b) 13 c) 17 d) 47
11. Calculate the simple interest on N5000 for 2 years at 5% per annum: _______________. a) N250 b) N500 c) N1000 d) N2000
12. Increase N1000 by 20%: _______________. a) N1200 b) N1500 c) N200 d) N800
13. Calculate the area of the shaded part in the diagram provided: _______________. a) 35 cm² b) 42 cm² c) 28 cm² d) 21 cm²
14. What is the lowest term for the fraction 5/10? a) 5/10 b) 1/2 c) 1/10 d) 5/2
15. What is the decimal equivalent of 3/5? a) 0.5 b) 0.6 c) 0.3 d) 0.8