6.EE.B.6 Grade 6 · Expressions and EquationsUse variables to represent numbers and write expressions when solving a real-world or mathematical problem; understand that a variable can represent an unknown number, or, depending on the purpose at hand, any number in a specified set.Common Core State Standards for Mathematics, as adopted in the Massachusetts Curriculum Framework for Mathematics (2017), Grade 6.
Play the game: Letters for Numbersfree, no sign-up →Letters stand for quantities you can still picture. A balance stays level, a function machine shows what it did, and doubling grows as a shape you can watch.
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.
6.EE.A.1Whole-number exponents (5 squared, 2 to the 10th)6.EE.A.2Letters stand for numbers: write, evaluate and name the parts of 2n + 36.EE.A.3Use the distributive property to write equivalent expressions6.EE.A.4Equivalent expressions: put numbers in and see the dots match every time6.EE.B.5Which values from a set make an equation or inequality true: test each one6.EE.B.7Solve x + p = q and px = q on a balance scale6.EE.B.8Write x > c or x < c; infinitely many answers, drawn on a number line6.EE.C.9Two quantities that change together: table, graph and d = 65tColorMyMath · 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.