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8 questions with a Summer Vacation theme plus a full answer key. Perfect for Grade 1 Math.
⬇ Download WorksheetStudents will subtract within 20 using counting strategies and number relationships.
After Q6, pause and ask students: Maya had 15 sea glass pieces but lost some — how many did she lose? Have partners act out the subtraction using small beach pebbles or counters before writing the number sentence.
...plus 5 more questions in the full worksheet
Instructions: Read each clue Maya finds. Write the missing number to help Maya reach her hidden treasure.
Standard: CCSS.MATH.1.OA.C.6
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First graders need repeated practice decomposing numbers and finding the missing part in subtraction situations, which CCSS.MATH.1.OA.C.6 specifically targets as foundational for understanding the inverse relationship between addition and subtraction. Use this worksheet during guided math groups to assess whether students can fluently solve subtraction problems within 10, then have them explain their strategies aloud to build conceptual understanding before moving to abstract notation.
This printable Math worksheet is designed for Grade 1 students and covers Subtraction. The Summer Vacation theme keeps kids engaged while they practice essential Math skills. Every worksheet includes a full answer key making it easy for parents and teachers to check work instantly. Aligned to Common Core State Standards (CCSS) for Grade 1 Math. Print-ready at US Letter size. No login required — download and print in seconds.
Last updated: April 2026
Subtraction is one of the first ways young mathematicians learn to think about taking away, losing, or comparing amounts—skills they use every single day. When your first grader counts down from 10 or figures out how many cookies are left after eating two, they're building the foundation for all future math. At ages 6-7, children's brains are developing the ability to hold a starting number in their mind while removing a quantity, which strengthens working memory and logical thinking. Subtraction also helps children understand relationships between numbers and prepares them for word problems, money concepts, and even measuring during activities like a summer vacation when they might count down days or track how many snacks are left. Mastering subtraction within 10 gives first graders confidence and independence in solving problems they encounter in real life.
Many first graders count backward from the starting number instead of counting up from the number being subtracted—for example, they'll say "10, 9, 8, 7" when solving 10 - 3, landing on 7 instead of correctly identifying 3. Another common error is reversing the order, writing 3 - 10 when the problem shows 10 - 3, because they haven't internalized that the bigger number comes first. You'll spot these mistakes when a child solves the same problem differently each time or seems confused about which number to start with. Using physical objects like blocks or counting bears to act out the problem helps children see exactly what's happening.
Play a quick "subtraction snack game" at snack time: place 8 crackers on your child's plate, then remove 3 and ask, "How many are left?" Let them eat the removed ones, reinforcing that subtraction means taking away. Do this with 2-3 different amounts so they practice without it feeling like work, and they'll naturally strengthen their mental math while enjoying a treat. This real, hands-on approach helps six-year-olds connect the abstract minus sign to something they can see and touch.
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