APPROXIMATION AND ESTIMATION (SIGNIFCANT AND DECIMAL PLACES) SIGNIFICANT: TO ROUNDOFF A NUMBER CHANGE 0,1,2,3,4 TO 0 WHILE 5,6,7,8,9 TO 1 AND ADD IT TO THE NEXT NUMBER Example 1: round off 492.763 to (a) 3 s.f (b) 3 s.f (c) 2 d.p (d) 4 d.p Solution: (a). 492.763 = 49 (since the third number is […]
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HIGHEST COMMON FACTOR AND LOWEST COMMON FACTOR See also WHOLE NUMBER AND DECIMALS NUMBERS SIMPLE EQUATIONS INVOLVING FRACTIONS MEASURE OF CENTRAL TENDENCY Data Presentation CHANGE OF SUBJECT OF A FORMULA
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ALGEBRAIC EXPRESSION See also MULTIPLICATION AND DIVISION OF DIRECTED NUMBERS APPROXIMATION AND ESTIMATION ARITHMETIC FRACTIONS HIGHEST COMMON FACTOR AND LOWEST COMMON FACTOR
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FRACTIONS (TYPES OF FRACTIONS), RATIO AND PERCENTAGES See also HIGHEST COMMON FACTOR AND LOWEST COMMON FACTOR WHOLE NUMBER AND DECIMALS NUMBERS SIMPLE EQUATIONS INVOLVING FRACTIONS MEASURE OF CENTRAL TENDENCY Data Presentation
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HOUSEHOLD ARITHMETIC (SIMPLE INTEREST, PROFIT AND LOSS, DISCOUNT AND COMMISSION) PROFIT AND LOSS When a trader buys or sells goods, the price at which he /she sells is called selling price while the price at which he/she buys is called cost price. When the good is sold at a price greater than the cost price,
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MULTIPLICATION AND DIVISION OF DIRECTED NUMBERS Revision on addition and subtraction of directed numbers Note that: (a). + + = + OR – – = + (Replacing the same signs that apprear together by a positive sign (b). + – = – OR – + = – (Replacing two different signs that appear together by
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WHOLE NUMBER AND DECIMALS NUMBERS See also SIMPLE EQUATIONS INVOLVING FRACTIONS MEASURE OF CENTRAL TENDENCY Data Presentation CHANGE OF SUBJECT OF A FORMULA WORD PROBLEMS
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ALGERAIC FRACTIONS To add or subtract fractions with different denominators, first change them to equivalent fractions. This is done by finding the L C M of the denominators Example1: Simplify 2a/5 + 4a/3 Solution: The L C M is 15 6a + 20a/ 15 = 26a/15 Example 2: Simplify 3/5x + 1/2x – 1/4x Solution:
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