Common Core Math · Grade 1

1.MD.A.2 Measure length in whole non-standard units

Express the length of an object as a whole number of length units, by laying multiple copies of a shorter object end to end; understand that the length measurement is the number of same-size length units that span it with no gaps or overlaps.

Why water teaches this standard well

Students measure the length of a rain gutter or a puddle's edge by laying paperclips end to end and counting them, discovering that gaps or overlaps throw off the count. This is the direct forerunner of measuring rainfall or pipe length with a standard ruler in second grade.

Materials tagged with this code are written to the full standard , and each carries a written note explaining the alignment. See how we review materials.

9 materials aligned to 1.MD.A.2

Lesson plans

Worksheets

Math problem sets

Classroom activities

Grade 1 Classroom activity

Ordering Three Water Bottles at Turnstone School

A 30-minute grade 1 health activity ordering three bottles by height, measuring each in cubes, then filling them to see whether the tallest holds the most.

Health & Consumer Science 30 min