Adding Doubles Plus 1 Worksheets for 1st Grade
Add two numbers that are exactly 1 apart, using a doubles fact as a shortcut. 15 free printable worksheets, each with an answer key.
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Click a worksheet to open the PDF, or grab the matching answer key. Every sheet prints on one page.
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Worksheet #15
Adding Doubles Plus 1: what children learn
"Doubles plus 1" facts (like 6 + 7) sit one step past a memorized doubles fact — 6 + 7 is just double-6 (12) plus one more, a specific shortcut worth practicing on its own.
Adding Doubles Plus 1: worked example
6 + 7 = 13
6 + 7 is one more than the doubles fact 6 + 6 = 12, so 6 + 7 = 12 + 1 = 13.
Adding Doubles Plus 1: a common mistake to watch for
Kids sometimes don't notice the two numbers are only 1 apart and count on the slow way instead — asking "what doubles fact is this one more than?" nudges them toward the shortcut.
Adding Doubles Plus 1: how to help at home or in class
Deal two cards one apart, such as a seven and an eight. Ask your child to find which one is the smaller number, double it, and then add one more. Practice with dominoes, picking the ones where one half has an extra dot. Let your child describe the trick in their own words. Once your child chooses the shortcut on their own for pairs one apart, try the same idea with numbers two apart.
What is on these Adding Doubles Plus 1 worksheets
This set has 15 different worksheets for 1st grade, with 8 questions on each and a matching answer key for every sheet. The instruction printed on each worksheet is: “Add the numbers and write the sum.”
Example questions like the ones on these worksheets, with their answers:
- 7 + 8 =15
- 4 + 5 =9
- 6 + 7 =13
- 1 + 2 =3
- 4 + 3 =7
- 2 + 3 =5
- 6 + 5 =11
- 10 + 9 =19
Every answer on every sheet is checked by a separate program before the worksheet is published. How we check answers