How do I print or save these worksheets as a PDF?

Click Print worksheet and choose your printer, or pick “Save as PDF” as the destination to keep a digital copy. The answer key prints on its own page.

Can I get a fresh set of problems?

Yes. Click New problems for a brand new randomly generated worksheet, as many times as you like.

Is this worksheet generator free?

Yes. Every generator on the site is free to use, with no account, no watermark and unlimited printing for classroom or home use.

Mental math worksheet generator

Numbers chosen so a strategy — doubling, bridging ten, compensating — beats the algorithm.

Mental Math

Name: Date:

1.
49 + 50 =
2.
19 + 20 =
3.
27 + 28 =
4.
41 + 42 =
5.
28 + 29 =
6.
21 + 22 =
7.
9 + 10 =
8.
39 + 40 =
9.
49 + 50 =
10.
42 + 43 =
11.
26 + 27 =
12.
47 + 48 =
13.
45 + 46 =
14.
48 + 49 =
15.
33 + 34 =
16.
16 + 17 =
17.
26 + 27 =
18.
19 + 20 =
19.
39 + 40 =
20.
44 + 45 =

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Mental Math — Answer Key

Name: Date:

1.
49 + 50 =
99
2.
19 + 20 =
39
3.
27 + 28 =
55
4.
41 + 42 =
83
5.
28 + 29 =
57
6.
21 + 22 =
43
7.
9 + 10 =
19
8.
39 + 40 =
79
9.
49 + 50 =
99
10.
42 + 43 =
85
11.
26 + 27 =
53
12.
47 + 48 =
95
13.
45 + 46 =
91
14.
48 + 49 =
97
15.
33 + 34 =
67
16.
16 + 17 =
33
17.
26 + 27 =
53
18.
19 + 20 =
39
19.
39 + 40 =
79
20.
44 + 45 =
89

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Frequently asked questions

How do I print or save these worksheets as a PDF?: Click Print worksheet and choose your printer, or pick “Save as PDF” as the destination to keep a digital copy. The answer key prints on its own page.
Can I get a fresh set of problems?: Yes. Click New problems for a brand new randomly generated worksheet, as many times as you like.
Is this worksheet generator free?: Yes. Every generator on the site is free to use, with no account, no watermark and unlimited printing for classroom or home use.