Better Lesson
Better Lesson: Walking the Number Line
The number line is a powerful math tool students can use to model their thinking when solving addition and subtraction problems. Use this lesson to help students use the number line to count forwards and backwards from 0 to 30.
University of Cambridge
University of Cambridge: Nrich: Routes 1 and 5
Sharpen your logic and basic arithmetic skills while working on this challenge. Solution.
Purple Math
Purplemath: Finding Quadratics From Their Zeroes
Students often have difficulty "working backwards" from the solution of a problem to its original question. Finding a polynomial, given its roots, is an example of a "working backwards" problem. Here are several examples using different...