Question 5 (b) - Figure it out (Page 42, 43, 44) - Chapter 2 Class 7 - Arithmetic Expressions (Ganita Prakash)

Transcript

Question 5 (b) Identify which of the following expressions are equal to the given expression without computation. You may rewrite the expressions using terms or removing brackets. There can be more than one expression which is equal to the given expression. (b) 93 + 37 × 44 + 76 (i) 37 + 93 × 44 + 76 (ii) 93 + 37 × 76 + 44 (iii) (93 + 37) × (44 + 76) (iv) 37 × 44 + 93 + 76Given expression 93 + 37 × 44 + 76 = 37 × 44 + 93 + 76 (i) 37 + 93 × 44 + 76 We just check the multiplication first Since 93 × 44 > 37 × 44 Thus, this expression is larger (ii) 93 + 37 × 76 + 44 We just check the multiplication first Since 37 × 76 > 37 × 44 Thus, this expression is larger (iii) (93 + 37) × (44 + 76) This seems multiplication of two very large number Thus, this expression is larger (iv) 37 × 44 + 93 + 76 Here, 37 × 44 is same as given expression So, we check each term 37 × 44 vs 37 × 44 – it is same 93 vs 93 – it is same 76 vs 76 – it is same Thus, it is same expression