Maths Std. IV Chapter 5

5. Multiplication

1. Complete the table.

2. Write the properties of multiplication with suitable examples.

3. Circle the correct answer.
(a) 231 x 100 = 2,300;    2,31,000;     23,100;   23,010
(b) 926 x 1,000 = 92,600;   9,26,000;   9,260;    9,20,600

4. Fill in the blanks.
(a) 82 x 3000    (b) 364 x 800

5. Find the product.
(a) 5,203 x 7   (b) 9,806 x 2

6. Multiply using the expanded form and verify the result by actual  multiplication.
(a) 6,153 x 8   (b) 2,956 x 3

7. Find the product.
(a) 149 x 39    (b) 92 x 38   (c) 9,922 x 76   (d) 68 x 137   (e) 8,973 x 602

8. Estimate the product by rounding off to the nearest 10.
(a) 76 x 52   (b) 108 x 175

9. Estimate the product by rounding off to the nearest 100.
(a) 472 x 594   (b) 8,792 x 361

10. Observe the following pattern and complete it.
      1 x 9 + 2                           = 11
      12 x 9 + 3                         = 111
      123 x 9 + 4                       = 1111
      1234 x 9 + ____               = _____________
      123456 x 9 + ____           = _____________
      1234567 x 9 + ____         = _____________

      12345678 x 9 + ____       = _____________

11. Use the simple tricks to find the products.

(a) 8 x 10   (b) 13 x 15   (c) 23 x 25

12. Multiply 526 and 4,615 by 11 using addition.

13. Word problems.

(a) A pet store has 15 tanks of fish. If each tank has 46 fish, how many fish

     does the pet store have?

(b) A company has 1,563 staff workers. There are 80 company vans. If 8 staff

     workers come in each van, how many people come by other means of transport?
(c) A travel agency sold 18 holiday packages for Malaysia and 16 holiday packages
     for Australia. If one holiday package for Malaysia costs Rs. 27,985 and Australia
     Rs. 49,869, how much did the agency earn from the two holiday packages?

(d) Frame two word problems for 3,432 x 6.

14. Simplify 20 x 6 - 16 x 2 + 4 x 5

15. Solve by lattice multiplication.

(a) 145 x 415   (b) 345 x 15

16. Multiply using both lattice and column methods.

(a) 211 x 16   (b) 639 x 705

17. Choose the best estimate and tick the correct answer.
(a) A jewellery company ordered 82 boxes of silver beads. There were 77 beads in each
     box. About how many silver beads did the jewellery company order?
     ____ 64,000                ____ 6,300
(b) A grocery store sold 8 coupons to each house in their locality. There are 639 houses
     in the locality. About how many coupons did the grocery shop distribute in all?
    _____ 5,100                 ____ 5,200