Question

Please answer this all questions​

Answer 1

Answer:

5. i) 23000000 = $2.3$ × $10^{7}$

   ii) 64280000 = $6.428$ × $10^{7}$

6. i) 5807294 = 5000000 + 800000 + 7000 + 200 + 90 + 4

   ii) 8604372 = 8000000 + 600000 + 4000 + 300 + 70 + 2

7. a) $10^{t}$ = 100000

          $t$ = 5

   b) $2^{x}$ = 1024

         x = 10

8. $3\frac{1}{5} + 2\frac{1}{10} - 1\frac{1}{2} - \frac{1}{4}$  =  $\frac{16}{5} + \frac{21}{10} - \frac{3}{2} - \frac{1}{4}$

                                  =  $\frac{106 - 35}{20}$

                                  =  $\frac{71}{20}$

                                  = $3\frac{11}{20}$

9. Given,

              Length of the paper = $15\frac{3}{4}$ cm

              Breadth of the paper = $12\frac{1}{2}$ cm

              Perimeter of the paper = 2(Length + Breadth)

                                                      = 2($\frac{63}{4} + \frac{25}{2}$)

                                                      = 2($\frac{113}{4}$)

                                                      = $\frac{113}{2}$ cm

∴ The perimeter of the paper is $\frac{113}{2}$ cm.

10. Let the unknown rational number be x.

     Then, $\frac{42}{66}$ / $\frac{-7}{11}$ = -1.

∴ $\frac{-7}{11}$ should be multiplied by -1 to get $\frac{42}{66}$.