At the end of this lesson, students should be able to estimate the answers to questions involving addition and subtraction of decimals.
An estimate is a rough guess. In this lesson, we will learn how to estimate decimals in addition and subtraction questions.
To estimate a decimal, you may quickly round it to the nearest whole number, tenth, hundredth or thousandth before adding or subtracting.
Estimate the following decimals.
a) 4.6 + 2.1 b. 5.1 – 3.5
Estimate the following decimals(leave your answer to 1 decimal place)
Estimate to the nearest hundredth.
a) 13.725 + 3.123 b. 15.123 – 12.281
NB: The decimals are rounded to 2 decimal places before adding or subtracting.
Unit 10 Lesson 11: Exercise 1
Estimate the following. Leave your answers as whole numbers.
Unit 10 Lesson 11: Exercise 2
Estimate these decimals leaving your answers to 1 d.p
Unit 10 Lesson 11: Exercise 3
Estimate these decimals. Your answers should be left at 2 decimal places.