3.NBT.A.1 Grade 3 · Number and Operations in Base TenUse place value understanding to round whole numbers to the nearest 10 or 100.Common Core State Standards for Mathematics, as adopted in the Massachusetts Curriculum Framework for Mathematics (2017), Grade 3.
Play the game: Nearest Tenfree, 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.
3.NBT.A.2Add and subtract within 1000 fluently3.NBT.A.3Multiply a one-digit number by a multiple of ten: 9 × 80 is 72 tensColorMyMath · 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.