Free printable practice
Adding Doubles Minus 1 Practice Activities
Students practice near-double addition facts by using a known double and adjusting by one for faster, more flexible fact recall.
Practice that builds confidence
Understanding doubles minus 1
These adding doubles minus 1 worksheets help students use a known double fact to solve a nearby addition fact, such as thinking 6 + 5 is 6 + 6 minus 1. The focus is mental math, not counting every object one by one.
The printable math drills include focused addition facts, mixed near-double practice, answer spaces, and fact patterns that help children see how doubles support faster addition within basic fact practice.
A doubles minus 1 fact has two addends that are next to each other, such as 4 + 3, 7 + 6, or 9 + 8. Students use the larger double, then subtract 1: 7 + 6 is one less than 7 + 7, so it is 13. This builds a bridge from memorized doubles to related facts.
How practice develops
Children usually begin by reviewing exact doubles like 5 + 5 and 8 + 8. Then they solve near doubles where one addend is one less. Later, the facts can be mixed so students must decide when the strategy fits. The goal is flexible recognition: “These numbers are neighbors, so a double can help.”
Parent routine at home
Pick five facts, such as 3 + 2, 5 + 4, 6 + 5, 8 + 7, and 10 + 9. Ask your child to say the double first, then the adjustment: “8 + 8 is 16, so 8 + 7 is 15.” Keep the language consistent and have your child explain the thinking before writing the answer. If needed, use small objects in two rows to show one row has one fewer.
Classroom uses for teachers
Teachers can use these pages during addition fact review, math centers, morning work, or small-group fluency practice. They pair well with ten-frames, counters, number lines, and quick oral warm-ups. Students can also sort facts into “double,” “double minus 1,” and “other” before solving.
Common errors to watch for
Some students double the smaller number and forget to add 1, while others double the larger number and forget to subtract 1. For example, 6 + 5 may be answered as 12 or 11 if the adjustment is confused. Ask students to name which double they used and whether the answer should be one more or one less.
Free printable PDF download
Use this adding doubles minus 1 worksheet page to preview the activity, print it, or download it as a PDF for quick practice. It works well for homework, homeschool lessons, tutoring, morning work, revision, and classroom centers.
Answers and answer key support
After the child completes the worksheet independently, parents and teachers can use the answer support or answer key information to check the work, review mistakes, and choose the next practice step.
Why iBloom worksheets help
The iBloom worksheets keep the fact type clear so students can strengthen one strategy before facing mixed addition. A child-friendly strategy is: spot neighbor numbers, double the bigger number, take away 1, then check if the answer makes sense.
Helpful answers
Frequently asked questions
What is an adding doubles minus 1 fact?
It is an addition fact with neighboring addends where students can double the larger number and subtract 1, such as 8 + 7 = 16 - 1 = 15.
How is doubles minus 1 different from doubles plus 1?
In doubles minus 1, students usually double the larger addend and subtract 1. In doubles plus 1, they double the smaller addend and add 1.
Which facts work well with this strategy?
Facts such as 3 + 2, 5 + 4, 7 + 6, 8 + 7, and 10 + 9 work well because the addends are one apart.
Why teach this instead of counting on?
Counting on is useful, but near-double thinking helps students use number relationships and recall facts more efficiently.
What should I do if a student keeps choosing the wrong double?
Have the student circle the larger addend, say its double aloud, and then write “minus 1” before solving the fact.
Is this adding doubles minus 1 worksheet free?
Yes. You can preview it for free and use the printable worksheet for home or classroom practice.
Can I download this adding doubles minus 1 worksheet as a PDF?
Yes. Use the worksheet download option to save a printable PDF, or print the worksheet directly from the page.
Does this adding doubles minus 1 worksheet include answers or an answer key?
When the activity has fixed answers, iBloom includes answer support so parents and teachers can check the completed worksheet.