Decimals Questions and Answers - Form 1 Topical Mathematics

Questions

1. Use a calculator to find;
   1. 8754.3 x 53.84
   2. 0.8341 + 8.72
   3. Hence find:
      
2. Express the recurring decimal below to a fraction 5.72 and leaving your answer in the form ^a/_b where a and b are whole numbers
3. Evaluate:- 0.38 x 0.23 x 2.7 without using tables or a calculator
4. Without using mathematical tables or calculator, evaluate:
   
   Leaving the answer as a fraction in its simplest form.
5. Find without using a calculator, the value of :
   

Answers

1.  
   1. 471331.512
   2. 7.273352
   3. 40.16649692
2. Let r = 5.722222………………..
   10r = 57.22222……………….
   100r = 572.22222…………..
   100r = 572.2222……………
   10r = 57.222 ………….
   90r = 515
3. 38 x 23 x 27 x 100 x100000
   114 x 575
   = 36 For elimination of decimals For correct answer only
4. 84 x 132 x 35
   287 x 560
   = ⁹⁹/₄₁
5. 12 x 0.25 – 12.4 ÷ 0.4 x 3
   ⅛ of 2.56 + 8.68
   3 – 31 x 3
   0.32 + 8.68
   ^-90/₉
   = -10