Name: Adding Nine Worksheet
SKU: 62c5d93a1c8de35c3c0cb6f5
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In the classroom

Teaching tips & learning objectives

Learning objectives

Students will fluently add 9 to a one-digit number within 20.
Students will apply the plus-nine fact to two-, three- and four-digit addends.
Students will recognize the plus-nine sum regardless of which addend is written first.

Teaching tips

Because the four pages increase from single-digit to multi-digit numbers, they can be assigned to different students in the same class for differentiation rather than worked through in sequence by everyone.
The three Challenge problems on each page extend past that page's usual number range, making them useful as an extension for students who finish early.
Since every fact appears in both addend orders (for example 4 + 9 and 9 + 4), the set can double as practice for recognizing that order does not change the sum, not just for fact recall.

Skills covered

Plus-nine fact fluency — students solve equations from 4 + 9 through 9 + 9 to build automatic recall of the plus-nine addition facts within 20.
Multi-digit addition with a single-digit addend — students add 9 to two-, three- and four-digit numbers such as 616 + 9 and 9 + 3272 across the later worksheets.
Commutative-property recognition — every fact appears in both addend orders (4 + 9 and 9 + 4), reinforcing that order does not change the sum.
Extension problem-solving — three "Challenge" problems per page push beyond that page's typical number range.

Good to know

Questions teachers ask about this resource

How large do the plus-nine numbers get from the first sheet to the last?

The first page stays within 20, the second moves into the teens and twenties with challenge sums up to the 80s, the third mixes two- and three-digit totals, and the fourth reaches four- and five-digit totals such as 9 + 3272.

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Curriculum

Standards, concepts & topics

Standards

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.NBT.B.5 — Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.