Show:
Estimation of Sums
Estimation of Differences
Double Digit Addition
Double Digit Subtraction
Rounding
100
What is the estimated sum of 12 + 11?
20
100
What is the estimated difference of 24-13?
10
100
45+13=
58
100
52-11=
41
100
What is 13 rounded to the nearest 10?
10
200
What is the estimated sum of 23 + 35?
60
200
What is the estimated difference of 55-24?
40
200
36+62=
98
200
78-26=
52
200
What is 29 rounded to the nearest 10?
30
300
What is the estimated sum of 55 and 23?
70
300
What is the estimated difference of 59-25?
30
300
34+39=
73
300
52-45=
7
300
What is 45 rounded to the nearest 10?
50
400
What is the estimated sum of 45+52?
100
400
Tom has 74 pennies. He used 42 to pay for a snack. About how many pennies does he have now?
30 pennies
400
29+18=
47
400
Bill has 73 pieces of candy. He eats 29 of them. How many pieces of candy does he have left?
44
400
What is 123 rounded to the nearest 10?
120
500
What is the estimated sum of 86 and 32?
120
500
Rachel bought 84 stickers. She gave 43 away to her friends. About how many stickers does she have left now?
40
500
Wendy has 45 cats. She got 29 more. How many cats does she have now?
74 cats. That's too many!!!
500
Megan had 52 stuffed animals. She gave 25 away. How many stuffed animals does she have now?
27 stuffed animals
500
What is 114 rounded to the nearest 10?
110