well its very simple...
seven eights are 56, so you round that off to 60. and then you have 47, so you round that off to 80.
then you have 60x80. to work that out your cross out the "0"'s. now you have 6x8. which equals 48. now you have the "0"s. your crossed out two so n ow you add to your answer. 4800.
that's how you estimate :)
7/24
It works out at 0.73 when rounded to two decimal places.
47 x 13 = 611
7846 * 58 = 455 068
50
40 x (7/8) = 35 Work: 40/8 = 5 7 x 5 = 35
4.375
7/24
seven tenths
7.25 times 3.33=24.1425
5 times
235
it is 4/16, but you might want to reduce it.
Forty-seven times eighty-nine is four thousand one hundred eighty-three. In numbers, that's 47x89=4,183.
21/32
It works out at 0.73 when rounded to two decimal places.
1764