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This Subtracting Multiples Of 10 drill has 40 problems for Grade 1. Roses theme. Answer key included.
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Max discovered 80 roses scattered across the garden! He must collect them before the storm arrives.
Standard: CCSS.MATH.1.NBT.C.6
Subtracting multiples of 10 is a cornerstone skill that helps first graders build mental math confidence and understand how our base-10 number system works. When children can quickly compute problems like 45 − 10 or 70 − 20, they're developing number sense that makes larger subtraction problems feel manageable. This skill appears constantly in real life—counting down allowance, tracking toy inventory, or figuring out how many pages are left in a book. At ages 6–7, students' brains are primed to recognize patterns, and multiples of 10 provide the clearest, most predictable pattern in early arithmetic. Mastering this skill also reduces anxiety around subtraction and builds the foundation for two-digit subtraction strategies that come later. Children who grasp this concept feel more capable and willing to tackle harder math challenges.
Many first graders mistakenly subtract from both the tens and ones places, turning 35 − 20 into 15 instead of 15. Another frequent error is losing track of which digit changes—students may correctly identify that they're working with tens but subtract from the wrong column. Some children also confuse 30 − 20 with 3 − 2, forgetting the zero altogether. Watch for hesitation or counting on fingers for every problem; this signals they haven't internalized the pattern yet and need more concrete practice with tens frames or bundled manipulatives.
Play a simple "Flower Petal Subtraction" game at home: write a two-digit number (like 56) on paper, then take turns peeling away 10 at a time from an imaginary bouquet of roses, saying the new number aloud each time. This concrete, playful activity helps six-year-olds see that only the tens place changes while the ones stay put. Repeat with 3–4 starting numbers in short, fun sessions rather than drill-heavy practice; at this age, games stick better than worksheets.