Estimating Sums
Round to the nearest 10:
55
60
10 + 20 =
30
15 + 15 =
30
10 + 20 + 30 =
60
There are 3 apples in the basket and you take away 2. How many apples do you have now?
You have 2 apples. You took away 2 apples and left 1 in the basket.
Round the addition problem to the nearest 10.
38 + 21
40 + 20
11 + 22 =
33
65
25 + 25 + 25 =
75
I have a head and a tail, but no body. What am I?
A coin
Estimate the sum.
50 + 40
90
32 + 23 =
55
38 + 36 =
74
17 + 23 + 8 =
48
I am an odd number. Take away one letter and I become even. What number am I?
Seven
Round to the nearest 10. Estimate the sum.
41 + 29
40 + 30 = 70
62 + 26 =
88
65 + 29 =
94
11 + 22 + 33 =
66
What has hands and a face, but can't hold anything or smile?
A clock
Round to the nearest ten. Estimate to find the sum.
67 + 32
70 + 30 = 100
71 + 28 =
99
74 + 47 =
121
52 + 37 + 14 =
103
Mrs. Brown has 5 daughters. Each of these daughters has a brother. How many children does Mrs. Brown have?
She has 6 children. Each daughter has the same brother. There are 5 daughters and 1 son.