The Mathematician Helper

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PERIMETER OF REGULAR PLANE SHAPES

The perimeter of a plane shape is the length of its outside boundary or the distance around its edges. Irregular shape An irregular shape does not have a definite shape. To determine the perimeter of such shape, string or thread can be used to measure it. Place the string around the edge, then straighten it …

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ALGEBRAIC EXPRESSION

ALGEBRAIC EXPRESSION Definition with examples Expansion of algebraic expression Factorization of simple algebraic expressions   Definition with examples   In algebra, letters stand for numbers. The numbers can be whole or fractional, positive or negative. Example Simplify the following -5 x 2y -3a x -6b -14a/7 -1/3 of 36×2   Solution 1)    -5 x 2y = …

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DIRECTED NUMBERS

ADDITION AND SUBTRACTION OF DIRECTED NUMBERS Directed numbers are the positive and negative numbers in any given number line e.g   -4         -3         -2         -1         0          1          2          3           4 The (+) and (-) signs show the direction from the origin (o). To add a positive number move to the …

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FRACTIONS, RATIOS, DECIMALS AND PERCENTAGES

Fractions and Percentages A fraction can be converted to decimal by dividing the numerator by its denominator. It can be changed to percentage by simply multiplying by 100. Example 5.1 Change 3/8 into a decimal and percentage Convert 0.145 to percentage Solution 1)         3/8 = 0.375 in decimal 3/8 x 100% = 37.5% 2)         0.145×100=14.5% …

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