4.NBT.B.5 Grade 4 · Number and Operations in Base TenMultiply a whole number of up to four digits by a one-digit whole number, and multiply two two-digit numbers, using strategies based on place value and the properties of operations.Common Core State Standards for Mathematics, as adopted in the Massachusetts Curriculum Framework for Mathematics (2017), Grade 4.
Play the game: Squares AdventureStep 64 of the ColorMyMath curriculum · free, no sign-up →Past nine, color tells you which place a digit lives in. A ten is a triangle of ten dots; the number of triangles is the tens digit, so 34 is three triangles and four loose green dots.
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 64Squares 1 through 20Step 65Squares 1 through 25Step 66Algorithms for the squares of 10, 15, 20 … 55Step 67Algorithms for the squares of 60, 65 … 110Step 75One-digit by two-digit multiplicationStep 76Two-digit by two-digit multiplication — the Multiplication Dance4.NBT.A.1A digit is worth ten times as much one place to the left4.NBT.A.2Read and write big numbers in numerals, words and expanded form; compare with < = >4.NBT.A.3Round whole numbers to any place4.NBT.B.4Add and subtract multi-digit numbers fluently with the standard algorithm4.NBT.B.6Divide up to four digits by one digit, with remaindersColorMyMath · 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.