2.OA.A.1 Grade 2 · Operations and Algebraic ThinkingUse addition and subtraction within 100 to solve one- and two-step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using drawings and…Common Core State Standards for Mathematics, as adopted in the Massachusetts Curriculum Framework for Mathematics (2017), Grade 2.
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.
2.OA.B.2Add and subtract within 20 fluently; by the end of grade 2 know every sum of two one-digit numbers and the matching subtraction facts2.OA.C.3Odd and even: pair objects, count by 2s, write an even number as a double2.OA.C.4Count the objects in a rectangular array up to 5 by 5 by addingColorMyMath · 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.