Doubles & Doubles Plus One

Doubles plus one worksheets that make the near-doubles strategy click! This differentiated 3-page set uses friendly puppy mascots and clear cube-train models to help first graders master doubles and doubles plus one facts within 20 (CCSS 1.OA.C.6).

Each level follows the same kid-friendly layout, so students can move up the ladder with confidence:

• Level 1 (Support): 10 problems with cube trains. The shaded extra cube shows students exactly where the "one more" comes from.
• Level 2 (Practice): 10 problems with plain cube trains. Students circle the extra cube themselves, then solve both facts.
• Level 3 (Independent): 8 fact pairs with no models, plus two "Show What You Know" reasoning questions where students explain the doubles plus one strategy in their own words.

The set is print-and-go: one page per level, big equations, gray answer boxes for tidy work, and a compact answer key. Cute dachshund twins make the pages inviting and double as a color-when-finished bonus for fast finishers.

Perfect for math centers, small-group intervention, homework, or fact fluency practice during your addition strategies unit. Build mental math confidence one double at a time!