the most - 51<67<79 => 79 is ..., the least - 21<32<56 => 21 is ..., plus, 30 is less than 53 - 30<53, 39 is more than 21 - 39>21, in total, good estimate - There are 58 stamps. I estimate "There a 60 stamps" => 60 is a ... , actual number - I estimate "There a 60 stamps". There are 58 stamps. => 58 is a ..., 58 minus 15 is equal to 43 - 58 - 15 = 43, The sum of 45 and 23 is 68 - 45 + 23 = 68,

(Math 2): Week 8: Advanced

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