Find:
$(i).\ 1.3 \times 10$
$(ii).\ 36.8 \times 10$
$(iii).\ 153.7 \times 10$
$(iv).\ 168.07 \times 10$
$(v).\ 31.1 \times 100$
$(vi).\ 156.1 \times 100$
$(vii).\ 3.62 \times 100$
$(viii).\ 43.07 \times 100$
$(ix).\ 0.5 \times 10$
$(x).\ 0.08 \times 10$
$(xi).\ 0.9 \times 100$
$(xii).\ 0.03 \times 1000$

To do:

We have to find

(i) $1.3 \times 10$

(ii) $36.8 \times 10$

(iii) $153.7 \times 10$

(iv) $168.07 \times 10$

(v) $31.1 \times 100$

(vi) $156.1 \times 100$

(vii) $3.62 \times 100$

(viii) $43.07 \times 100$

(ix) $0.5 \times 10$

(x) $0.08 \times 10$

(xi) $0.9 \times 100$

(xii) $0.03 \times 1000$

Solution:

On multiplying a decimal by $10^n$, the decimal point shifts to the right by $n$ places.

Therefore,

(i) $1.3\times10 =13.0$

(ii) $36.8\times10=368.0$

(iii) $153.7 \times 10=1537.0$

(iv) $168.07\times10=1680.7$

(v) $31.1\times100=3110.0$

(vi) $156.1\times100=15610.0$

(vii) $3.62\times100=362.0$

(viii) $43.07\times100=4307.0$

(ix) $0.5\times10=5.0$

(x) $0.08\times10=0.8$

(xi) $0.9\times100=90.0$

(xii) $0.03\times1000=30.0$