Estimate 42 ÷ 0.49. 21 10 84 50

.49 is about 1/2

42 ÷ 1/2 = 84

thanks

To estimate the division of 42 ÷ 0.49, you can round both numbers to more convenient values and perform the division using those rounded values.

Let's round 42 to 40 and 0.49 to 0.5.

Now, divide 40 by 0.5:

40 ÷ 0.5 = 80

So, a reasonable estimation for 42 ÷ 0.49 is 80.

Among the given options, none of them are equal to 80.