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Adding and Subtracting Fractions Warm up What is the lowest common multiple of: Find a the missing numbers 2 = 6 3 and 4 12 5 15 5 and 6 30 4 and 6 12 3 15 = 8 40 3 and 8 24 5 and 10 10 25 5 = 6 30 Adding and Subtracting Fractions Two rulers add three rulers is: 5 rulers Four pens add five pens is: 9 pens Two pens add Five rulers is: 7 Pieces of equipment We canâ€™t so this until we have a name that describes both groups When we add fractions we need them to have the same name Adding and Subtracting Fractions 2 3 = 5 + 7 7 7 2 4 = 6 + 9 9 9 1 3 = 4 + 11 11 11 Adding and Subtracting Fractions 2 3 = 5 + 7 7 7 2 4 = 6 + 9 9 9 5 3 = 2 11 11 11 Adding and Subtracting Fractions We need to make sure the denominator of both fractions is the same before we add or subtract 2 3 = + 5 10 4 3 7 + = 10 10 10 We need a number in the 5 and 10 times table to use as our bottom number- 10? Adding and Subtracting Fractions We need to make sure the denominator of both fractions is the same before we add or subtract 1 5 = + 3 12 4 5 9 + = 12 12 12 We need a number in the 3 and 12 times table to use as our bottom number- 12? Adding and Subtracting Fractions We need to make sure the denominator of both fractions is the same before we add or subtract 2 3 = + 5 6 12 15 27 + = 30 30 30 We need a number in the 5 and 6 times table to use as our bottom number30? Adding and Subtracting Fractions We need to make sure the denominator of both fractions is the same before we add or subtract 7 2 = 8 3 21 16 5 = 24 24 24 We need a number in the 8 and 3 times table to use as our bottom number24? a) b) c) d) e) 7/8 8/12 7/9 7/10 2/3 a) b) c) d) e) 11/12 7/10 8/15 16/12 or 1 ¼ 11/24 a) b) c) d) e) 1 7/12 1 5/56 29/30 29/52 1 1/10 a) b) c) d) e) 5/8 5/12 1/3 2/5 1/2 a) b) c) d) e) 7/20 8/21 23/36 9/22 71/126 Adding and Subtracting Fractions Click for answers