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Estimation
Con il contributo di: O'Kane
5.46 ---> 5         (nearest whole number , 1 significant figure)
3418 ---> 3000         (nearest 1000, 1 significant figure)
275---> 300         (nearest 100, 1 significant figure)
square root of 24 ---> square root of 25
look for the nearest square number
31---> 30          (nearest 10, 1 significant figure)
With estimation
Here is an example
Round to 1 significant figure
3
31   x   694
0
x
31 to nearest 10
694 to nearest 100
7
00
=
21
000
Round to 1 significant figure
79   x   41
x
=
Round to 1 significant figure
53   x   71
x
=
Round to 1 significant figure
39   x   43
x
=
Round to 1 significant figure
270   x   408
x
=
Round to 1 significant figure
605   x   788
x
=
Round to 1 significant figure

For example .... 2.9 ... write 3 (not 3.0)

6.7   x   4.9
x
=
Round to 1 significant figure
605   +   788
add !
+
=
2993   +   5021
Round to 1 significant figure
add !
+
=
Round to 1 significant figure
605   -   188
subtract !
-
=
Round to 1 significant figure
7992   ÷   203
divide !
÷
=
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