2nd Class Mental Ability Estimation Estimation

OBJECTIVES

·         Students will involve in estimating real-life quantities such as distance, areas and volumes.

·         Estimation allows students to make judgements about how much time, money, food ? they will need.

·         In estimation, students use their mathematical reasoning which ultimately saves time and money.

INTRODUCTION

Estimation is a rough calculation of the value, number, quantity, or extent of something.

Examples

1.             

How many sweets are in the box? Estimate.

(a) 6                                          (b) 7           

(c) 8                                          (d) 9

Ans.     (b) There are 7 sweets in the box

2.            Reha went to the zoo and saw some Giraffes and Alligators. She made a picture graph of the animals at the zoo:

Which animal did she see fewer of?

(a) Alligators                               (b) Giraffes     

(c) Both                                     (d) None of them

Ans.     (b) Count the number of each animal in the graph. She saw 7 Alligators and 3 Giraffes. So, she saw fewer Giraffes.

3.            Which bus is the shortest among the following?

(a) P                                         (b) Q          

(c) R                                          (d) S

Ans.     (d) Bus S is shortest among them.

4.            Which tower is taller than B?

(a) A                                         (b) B           

(c) C                                         (d) D

Ans.     (d) Tower D is taller than B.

5.            Estimate the weight of a rubber?

(a) 2 g                                       (b) 2 kg        

(c) 200 g                                    (d) 5 kg

Ans.     (a) The estimated weight of a rubber is 2g.