Page 136 - Demo

Arrow-Puffin-4_Semester-1 Maths 135 Simplify the following expressions.a) 579 236 + 66 b) 957 + 676 1,100 c) 1,006 665 + 348d) 12,750 9,360 + 9,310 + 247 e) 13,950 + 809 306f) Subtract 6,891 from the sum of 1,209 and 23,451.g) Find the difference between the greatest 6-digit number and the least 5-digit number.h) Add 7,325 to the difference of 6,785 and 10,185.ESTIMATION OF DIFFERENCETo estimate the difference, round off the given numbers.Example : Estimate the difference of 4,281 3,217.Solution : 4,281 rounded off to nearest thousands = 4,000 3,217 rounded off to nearest thousands = 3,000 = 4,000 3,000 = 1,000 Estimated difference of 4,281 3,217 is 1,000. 4,281 3,217 Actual difference of 4,281 and 3,217 is 1,064. 1,064 Estimate the difference of the following numbers.a) 7,432 1,843 b) 6,240 3,090 c) 8,196 6,949d) 3,265 1,515 e) 9,216 5,323 Let's Practise 3.13 Application Let's Practise 3.14 ApplicationLet's Understand Conceptual UnderstandingMaths in Real Life Case Study Based Questions Do the following story problems.Example : The salary of the chairman of a company is ` 75000 per month. He spends `8000 on house rent, ` 7000 on car, ` 25000 on household expenditure and he saves the remaining amount. Find the amount he saves regularly. Expenditure on house rent = 8,000 Expenditure on car = 7,000 Household expenditure = + 25,000 Total monthly expenditure = 40,000