CBSE Class 3 Mathematics Revision Worksheet Set 21

CBSE Class 3 Mathematics Worksheet (95) - Revision

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Ex – 20

Find the product . 1) 75 x 10 = 750 . 2) 387 x 10 =3870. ( like this do sum no 3 and 4) 5) 23 x 100 = 2300 . ( like this do sum no 6,7 ,8 and 9 in note book) 10) 4 x 1000 = 4000 . ( like this do sum no 11 and 12 in note book )

* To multiply a given number by 20,30,…… 90 or by 200,300 …….900 . we multiply a given number by 2,3,4,…… 9 respectively and put one or two zeros respectively to the right of the multiplicand and we get the product . . 1

13) 57 x 20 = 57 x 2 tens = 5 7
                                            x 2 tens
                                           _________
                                           11 4 tens = 1140
                                            __________
. 57 x 20 = 1140 Ans . ( like this do sum no from 14 to 23 in note book )

.                                                     1
24) 38 x 200 = 38 x 2 hundreds = 3 8
                                                      x 2 hundreds
                                                      __________
                                                     7 6 hundreds =7600
                                                     _____________
. 38 x 200 = 7600 Ans . ( like this do sum no from 25 to 30 in note book )

Ex – 22 (word –problem ) Do sum no 2,4,6,8,10, 12, 14, 16 in maths note book.
2)Solution : No of days in a week -- 7
No of weeks                               -- x 9
                                           ___________
Total No of days                            6 3
Ans -- There are 63 days in 9 weeks .

4)Solution :
cost of 1 cap is -- rs 50
No of caps          --  x 6
                           ________
cost of 6 caps --    300
Ans -- cost of 6 caps is rs 300 .

6) Solution :
wt of one basket of mangoes     – 3 6 kg
No of baskets of mangoes        -- x 1 0
                                             _________
Total wt of baskets of mangoes – 3 6 0
Ans Total wt of 10 baskets of mangoes are 3 6 0 kg

8) Solution :        1
one day has     -- 2 4 hours
No of days        -- x 3 0
                       _________
hours in 30 days -- 7 2 0
                           _________
Ans 720 hours in 30 days.

10 ) Solution :                  3
No of people in a bus   -- 6 5
No of buses                  -- x 6
                                    _________
No of people in 6 buses -- 3 9 0
                                     _________
Ans 390 people in 6 buses .

12 ) Solution :
No of bags of cement in 1 cart -- 1 6 8
No of carts                                -- x 1 0
                                                ________
Total No of bags in 10 carts      -- 1680
                                             ___________
Ans 1680 bags of cement in 10 carts .

14 ) Solution :
Distance covered in 1 hour – 300 km
1 Distance covered in 24 hour – 24 x 300 = 2 4
                                                                    x 300
                                                                 _________
                                                                      7200
                                                                __________
Ans Distance covered in 24 hour is 7200 km .

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