How Do You Do Grade 9 Mathematical Processes?
Do Operations with fractions. • Add and Subtract. Fractions can only be added, or subtracted, if they have the same denominator, other wise the answer is incorrect. For example, 2/5 + 1/5 = 3/5. To add or subtract fractions with different denominators, the first step is to find the lowest common denominator. For example, 3/4 + 1/2 = 3/4 + 1X2/2X2 • = 3/4 + 2/4 • = 5/4 or 1 1/4 • 3/4 – 1/3 = 3X3/4X3 – 1X4/3X4 • = 9/12 – 4/12 • = 5/12 • Multiply. To multiply fractions, divide the numerator and the denominator by any common factors. Any mixed numbers should first be converted to improper fractions. To divide by a fraction, multiply by its reciprocal. • /9 X 3/4 = 8/9 X 3/4 • = 2/3 X 1/1 • = 2/3 • • • 1/2 \ 6/7 = 7/2 \ 6/7 • • = 7/2 \ 7/6 • the reciprocal of 6/7 is 7/6.* • = 49/12 • 12 \ 49 = 4 R 1.* • = 4 1/12 • Do Operations with Integers. • an integer number line and integer chips are tools that can help you understand operations with integers. You may also think in terms of profit and
