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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 ! ÷ = |