Explanation:
when multiplying decimals
just multiply normally and finally place the sum of decimals on both of the numbers u have multipled
eg.0.2×0.3=2×3=6 =0.06 (placing the decimals)
when adding,
0.5
+0.8
=1.3
when the decimal goes over 10 take it to the units place
when dividing
just divide normally
also in another way
2.1×10=21
÷0.7×10=7
=3