When you want to find out "about" how
much, you estimate.
You use estimation when you don't need to know the exact
number.
You may want to find out "about" how many
children are in your school.
You may want to find out "about" how many cookies are in the cookie jar.
You can estimate two-digit numbers using rounding.
Then add the rounded numbers together to get an estimated sum.
36
Rounds to
40
39
Rounds to
+ 40
80
36 cookies + 39 cookies is about 80 cookies.
Practice estimating sums. Round then add to
find the estimated sum.
36
Rounds to
16
Rounds to
+ 21
Rounds to
+
+ 41
Rounds to
+
56
Rounds to
27
Rounds to
+ 21
Rounds to
+
+ 51
Rounds to
+
81
Rounds to
77
Rounds to
+ 11
Rounds to
+
+ 19
Rounds to
+
21
Rounds to
37
Rounds to
+ 29
Rounds to
+
+ 51
Rounds to
+
17
Rounds to
39
Rounds to
+ 67
Rounds to
+
+ 15
Rounds to
+
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