Mental Math
2 + 8 + 5 = ?
What is: 15
9 - n, when n = 7
What is 2.
Estimate by rounding:
$ .13 + .75
What is: $ .10 + .80 = $.90
Do not round, just solve the following problem:
$ .44 + $.12 = ?
What is: $.56
3 + 3 + 4 = ?
What is: 10
t = 14, when t = 9 ?
What is: 23
Estimate by rounding:
205 + 381 = ?
What is: 200 + 400 = 600
Do not round, just solve the following problem:
$7.85 - $ 2.40 = ?
What is: $5.45
2 + 4 + 8 = ?
What is: 14
4 + q, when q = 17 ?
What is: 21
Estimate by rounding:
3118 + 2846 + 1979 = ?
What is: 3,000 + 3,000 + 2,000 = $ 8,000
Do not round, just solve the following problem:
$ 16.90 + $ 73.04 = ?
What is: $89.94
7 + 1 + 3 + 1 = ?
What is: 12
42 - c, when c = 25 ?
What is: 17
6190 - 4915 = ?
What is: 6,000 - 5,000 = 1,000
Do not round, just solve the following problem:
$ 795.76 - $ 362.24 = ?
What is: $ 433.52
1 + 0 + 9 + 9 = ?
What is: 19
54 + k, when k is 17 ?
What is: 71
Estimate by rounding:
377,892 - 85,722 = ?
What is: 400,000 - 90,000 = 310,000
Do not round, just solve the following problem:
$ 741.13 + $ 206.64
What is: $947.77