1.OA.C.5 Grade 1 · Operations and Algebraic ThinkingRelate counting to addition and subtraction (e.g., by counting on 2 to add 2).Common Core State Standards for Mathematics, as adopted in the Massachusetts Curriculum Framework for Mathematics (2017), Grade 1.
Play the game: I CanStep 6 of the ColorMyMath curriculum · free, no sign-up →Addition is a length — dots laid end to end on the number line. Taking away comes down the same line. Every fact is shown as a picture before it is ever asked for from memory.
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.
Step 6Subtracting 1: counting back from 10Step 11Subtracting 1: counting back from 15Step 12Adding 2: counting by 2s to 10Step 14Subtracting 1: counting back from 20Step 17Subtracting 1: counting back from 25Step 19Subtracting 2: counting down by 2s from 10Step 20Adding 2: counting by 2s to 20Step 22Subtracting 2: counting down by 2s from 201.OA.A.1Word problems within 20: adding to, taking from, putting together, comparing, with the unknown anywhere1.OA.A.2Word problems with three numbers that add to 20 or less1.OA.B.3Use properties of operations to add (3 + 8 = 8 + 3; 2 + 6 + 4 = 2 + 10)1.OA.B.4Subtraction is an unknown-addend problem (10 - 8: what goes with 8 to make 10?)1.OA.C.6Add and subtract within 20: counting on, making ten, breaking down to a ten, doubles; fluent within 101.OA.D.7The equal sign: decide whether an equation is true or false1.OA.D.8Find the unknown number in an equation (8 + ? = 11)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.