1.OA.A.1 Grade 1 · Operations and Algebraic ThinkingUse addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using objects, drawings, and equations…Common Core State Standards for Mathematics, as adopted in the Massachusetts Curriculum Framework for Mathematics (2017), Grade 1.
Play the game: Story Problemsfree, 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.
1.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.5Relate counting to adding and subtracting (count on 2 to add 2)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.