THE 2 SET OF QUESTIONS I HAVE POSTED TODAY ARE FOR PRACTICE.  THE CLASSWORK SUMS HAVE A DUE DATE AS THEY  ARE MENTIONED IN THE CLASS. THE SUMS IN THE BLOG ARE FOR MORE PRACTICE. THEY DO NOT HAVE A DUE DATE, BUT, IT WOULD BE GOOD IF YOU PRACTICE THE SUMS AS THEY ARE BEING DONE IN CLASS. IF THE TOPIC HAS BEEN FINISHED IN CLASS, PRACTICE THEM IN YOUR FREE TIME SO THAT THEY CAN HELP YOU REVISE AND REVIEW YOUR UNDERSTANDING.

The second set of questions follows

1. Rewrite the number in scientific notation.

(a) 150,000,000  (b) 0.000000000009  (c) 0.000000000439  

2. Find a 4- digit number that is divisible by both 6 an 9 

    Find a 3- digit number that is divisible by both 3 and 5

3. Test each number below for divisibility.

	Divisible by………..
Number	By 2	By 3	By 5	By 6	By 8	By 9	By 11
75
7.960
964,172
38,297
384
987,766
786

4. What is the L.C.M of 342, 54 and 36  and the H.C. F of 434, 56, 78

5. (a) What is the  capacity of the smallest drum which can be filled completely using each of the mugs that can fill 75 ml, 200 ml, and 140 ml ?  

    (b) There are 4 poles measuring 105 cm, 120 cm, 125 cm and 140 cm. If they have to be arranged into pieces of equal length, what is the maximum length they have to be cut into?

6. Arrange in ascending order  6  ,   4  ,   1  ,   2 ,   7  

                                               9      5      3     8      4    

7. Raju had 600 mangoes in his orchard.   ½  of them were ripe. So he plucked them and took them home. A shopkeeper took ¼ of the mangoes  to sell. Raju sent the rest to the market. Due to the extreme heat nowadays, 1/5 of the remaining mangoes got spoilt. How many mangoes was he able to sell in the market?

Help to write statements while solving the sum  

Number of mangoes = _________              Number of mangoes plucked by him =____________

Number of mangoes taken by the shopkeeper   = ______       No. of mangoes spoilt = ________

Mangoes sold in the market = _________

Out of the total strength of 168 students in a school 2/3 were boys and 1/2 of the girls lived in the hostel. During the spring break, only 2/7 of the girls went home. 1/4 of the remaining girls took permission to stay in with their friends or guardians in the city. How many girls styaed back in the hostel?

8. Show the following operations by drawing boxes and shading them appropriately

   4  X   1                    6    -   3

  5         2                    7        4

9. a. Convert into fractions         4.89 = ________       89.098 =  ________     2.5555 = _________

    b. Convert into decimals        4  1   = _______         678  3    =  _______      78 45  =  _______
                                                    10                                  1000                            1000

    c.  Expand the following     34. 678             678. 786               34.008

    d.  Copy vertically and add        0.02 + 0.443            0.1897 +  98.6754        98.564  + 32. 546

    e.  Copy vertically and subtract        0.4567 - 0.094               181.007 - 16.346  

    f. What should be added to 23.231 to get 40.25?
        By how much is 4.567 greater than 2.112?
        How much will taking away 1123.51 from 8562.15 give?

    g. Multiply  63.4  X   0. 00053                0.5555  X  5.5               99.9    X   0,00011

    h. Divide      0.8  ÷ 2          0.064  ÷  8          0.645  ÷  0.5         35.052  ÷   2.3        0.52 ÷  0.013

    i. A jeans manufacturing company got an order to stitch 356 pairs of jeans. each pair of jeans requires           2.856 m of cloth. How much cloth is required to make 356 such pairs?

    j. CHALLENGE Ques: The total mass of Cho, Nash and Fatima is 168.9 kg. Cho is 15.8 kg heavier than  
        Nash but 8.6 kg lighter than Fatma. How heavy is Cho?

10. (1) Express each percentage as a decimal
     

Percent	Quantity	Working	Part of quantity
12%	20
38 %	6, 500 ml
78 %	Rs. 248

     (2) Lily earned Rs 2220 and gave 30 % of it to her mother every month. How much did she give her
           mother in 3 months?

     (3) Rani withdrew 5 % of her savings from an ATM. She spent 75 % of it to buy a computer and had Rs
           200 left. How much savings had she in the bank at first?

     (4)  Challenge Question: 60 % of the fish in a tank were goldfish and the remaining 96 fish were

guppies. 70 % of the total number of fish were sold. If there were 1/3 as many gold fish  as guppies

            left, how many guppies were there?