P.5 ALGEBRA

1. (18 – W) The difference of 18 and w. 1 Express the following as expressions 2 m a) The sum of 5r and 12 b) The difference of w and 6y. c) Three quarters of a number. d) Thrice the difference of 3c and 8d. e) Twice the sum of 10 and 8x. f) The average of 3, 7 and y g) Square the sum of k and 7. EXPRESSING ALGEBRAIC EXPRESSION AS PHRASES P.5 THEME: ALGEBRA TOPIC: ALGEBRA EXPRESSING ALGEBRAIC PHRASES AS EXPRESSIONS Examples Express the following phrases as expressions pages 181 Examples Ref: New MK pupils’ book5 7. Square of a number. Let the number be m M2 1. The sum of 9 and m. (9 + m) 2. The difference of 10 and k. (10 – k) 3. The sum of y and k (y + k) 4. Thrice the difference of m and n. 3( m + n) 5. Double the sum of 3k and 4. 2(3k + 4) 6. Half of m. Activity Express the following phrases as expressions. (5 + 1) balls + (2 + 3) pens = 6balls + 5pens 3.4(4m + p) Four times the sum of 4m and p. 2.4n + 3 V.) 5. Write in short: 5balls +2pens +1ball+3pens The sum of 4n and 3 5a+8 Ref: New MK pupils’ book5 pages 181 A third of the sum of 4m and n Express the following expressions as phrases. I.) n-19 II.) 3k +20 III.) 3(a - 8) IV.) w2 COLLECTING LIKE TERMS Examples 1. Write in short: a + a + a (a + a) + a 2a + a 3a 2. Simplify: x + y + 2x + 3y 3. Simplify: 5a + b + a – 2b + 3b + 4a (5a + a + 4a) + (3b + b) – 2b 10a + 4b – 2b (x + 2x) + (y + 3y) 3x + 4y 10a – 2b 4. Simplify 7y – 8m + y + 10m – 6 ACTIVITY 4 𝟑 (𝟒𝒎+ 𝒏) 7y + y + 10m – 8m – 6 8y -2m - 6 4. 𝟏 i.) 6y – 4 + 3y +13 6.