Question

what are the formulae of lesson fraction and decimals class 7.​

Answer 1

Answer:

1) \(\frac{product \,of \,numerators}{Product \,of \,denominators}\) . For example, \(\frac{4}{5}\times \frac{3}{7}= \frac{4\times3}{5\times7}=\frac{12}{35}\)

2) To multiply a decimal number by 10, 100 or 1000, we move the decimal point in the number to the right by as many places as there are zeros over 1.

Thus 0.69 × 10 = 6.9, 0.69 × 100 = 69, 0.69 × 1000 = 690 and for dimple decimal numbers see the example – 0.6 × 0.9 = 0.54

3) Division of a decimal number – To divide a decimal number by a whole number, we first divide them as whole numbers.

Then place the decimal point in the quotient as in the decimal number. example 12.4 ÷ 4 = 3.1