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Subtraction within 20 Color by Number — plant 10

Interactive worksheet with auto-grading, instant feedback, and printable PDF.

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Grades 1–2MathInteractive · Printable

Aligned to1.OA.C.62.OA.B.2

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2 Common Core standards

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About this worksheet

With 1-Digit Subtraction (within 20) Color by Number, the more problems students get right, the more of the picture appears. Students solve each problem, match the answer to the color key, and a hidden picture appears region by region. It builds subtraction fluency to 20, including bridging back through ten. Built for Grades 1–2 and aligned to 1.OA.C.6, 2.OA.B.2. Print it for morning work and centers or assign the self-checking interactive version for home — each download includes the PDF and the digital answer-key version.

Curriculum

Common Core standards covered

1.OA.C.6

Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 - 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).

2.OA.B.2

Fluently add and subtract within 20 using mental strategies.2 By end of Grade 2, know from memory all sums of two one-digit numbers.

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