1.MD.A.2: Length as same-size units laid end to end, no gaps and no overlaps

Express the length of an object as a whole number of length units, by laying multiple copies of a shorter object (the length unit) end to end; understand that the length measurement of an object is the number of same-size length units…Common Core State Standards for Mathematics, as adopted in the Massachusetts Curriculum Framework for Mathematics (2017), Grade 1.

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How ColorMyMath teaches it

Lengths, areas and volumes are built from the same dots, one more direction each time. Measuring means laying real units end to end with no gaps.

Every page is free and open — nothing to install, no account, and it works on a phone or a classroom board. Every number has its own color: 1 red, 2 orange, 3 yellow, 4 green, 5 blue, 6 purple, 7 brown, 8 pink, 9 cyan, and a number is that many colored dots.

More Grade 1 standards in Measurement and Data

• 1.MD.A.1Put three objects in order by length; compare two lengths through a third
• 1.MD.A.3Tell the time in hours and half-hours on a clock with hands
• 1.MD.C.4Organise data in up to three groups: how many in all, in each, and how many more or fewer
• 1.MD.C.5Know the coins and what each is worth: a dime is worth more than a nickel

ColorMyMath · getridoftheteacher.com · every number has its own color, and a number is that many colored dots. Matching a game to a standard is a judgement call; the official text is at doe.mass.edu.