Which One Doesn’t Belong: First Grade

Grade 1 / Math / Tch DIY
CCSS: Math.1.NBT.B.2a Math.1.NBT.B.2b

Common Core State Standards

Math

Math

1

Grade 1

NBT

Number & Operations in Base Ten

B

Understand place value

2a

Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:


a. 10 can be thought of as a bundle of ten ones -- called a "ten."


b. The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.


c. The numbers 10, 20, 30, 40, 50, 60, 70, 80, 90 refer to one, two, three, four, five, six, seven, eight, or nine tens (and 0 ones).

Download Common Core State Standards (PDF 1.2 MB)

Common Core State Standards

Math

Math

1

Grade 1

NBT

Number & Operations in Base Ten

B

Understand place value

2b

Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:


a. 10 can be thought of as a bundle of ten ones -- called a "ten."


b. The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.


c. The numbers 10, 20, 30, 40, 50, 60, 70, 80, 90 refer to one, two, three, four, five, six, seven, eight, or nine tens (and 0 ones).

Download Common Core State Standards (PDF 1.2 MB)



A "Which One Doesn't Belong" routine encourages students to reason about the similarities and differences among a set of numbers, expressions, shapes, or images.

Tch visited Kristin's Gray's school. Watch the video.

Watch all the videos in this series.

Common Core Standards
Math.1.NBT.B.2a, Math.1.NBT.B.2b

Supporting Materials

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  • Lesson Plan: Which One Doesn't Belong Planning Guide.PDF

  • Reflection and Resources.PDF

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Tch Special Which One Doesn’t Belong: First Grade

Grade 1 / Math / Tch Diy

Which One Doesn’t Belong: First Grade