Question

Explain how an estimate helps you to place the decimal point when multiplying 3.9 * 5.3​

Answer 1

3.9 × 5.3 = 20.67

Step-by-step explanation:

given data

digit 1 = 3.9

digit 2 = 5.3

to find out

multiplying 3.9 * 5.3​

solution

we know that 3.9 round about = 4

and 5.3 round about = 5

so 5 × 4 will be = 20

but here when we remove decimal

simple multiply it as

`(39)/(10)` ×
`(53)/(10)`

here 39 × 53 = 2067

and 10 × 10 = 100

so now we get

`(39)/(10)` ×
`(53)/(10)` =
`(2067)/(100)`

put here again decimal point

3.9 × 5.3 = 20.67