Endless Math Sheets

Missing Addend Worksheets

Missing addend problems such as 7 + ___ = 12 build the link between addition and subtraction. Students learn that an equation is a balance, not just an instruction to compute.

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Sheet code FVA2NH
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Find the Missing Number

Score / 30

Write the missing number.

1.7+=14
2.+1=10
3.+12=12
4.8+=18
5.+7=20
6.+10=12
7.+4=4
8.+1=6
9.+13=19
10.+5=11
11.17+=17
12.11+=11
13.+7=10
14.+16=20
15.14+=20
16.3+=18
17.+15=18
18.11+=18
19.+10=11
20.6+=13
21.+2=7
22.4+=10
23.+4=6
24.8+=9
25.10+=16
26.6+=8
27.+13=13
28.+4=15
29.12+=17
30.+16=19
endlessmathsheets.comSheet FVA2NH

Answer keyFind the Missing Number

Write the missing number.

1.7+7=14
2.9+1=10
3.0+12=12
4.8+10=18
5.13+7=20
6.2+10=12
7.0+4=4
8.5+1=6
9.6+13=19
10.6+5=11
11.17+0=17
12.11+0=11
13.3+7=10
14.4+16=20
15.14+6=20
16.3+15=18
17.3+15=18
18.11+7=18
19.1+10=11
20.6+7=13
21.5+2=7
22.4+6=10
23.2+4=6
24.8+1=9
25.10+6=16
26.6+2=8
27.0+13=13
28.11+4=15
29.12+5=17
30.3+16=19
endlessmathsheets.comSheet FVA2NH

What's on this worksheet

Addition sentences within 20 with one number missing. The blank moves between the first and second position. Each sheet comes with an answer key on a separate page.

Teaching tips

  • Encourage counting up from the number you know: from 7, count up to 12.
  • Ask students to write the related subtraction fact: 12 − 7 = 5.

How to use this worksheet maker

Press New worksheet for a fresh set of problems, then Print. To save a PDF instead, choose "Save as PDF" in the print window. Every sheet has a short code in the bottom corner. Copy the link to a sheet and you can print exactly the same problems again later, which is handy for retakes and for sharing with other teachers.

Common Core alignment: 1.OA.D.8 (Grades 1–2).

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