Numbers & Arithmetic

7 interactive Mathematics simulations on numbers & arithmetic.

Mathematics · Numbers & Arithmetic Square Roots and Cube Roots – Side of a Square and a Cube A square with area S has side √S; a cube with volume V has side ∛V. Drag the square's corner or the cube's vertex to change S and V and... Ages 14–15
Mathematics · Numbers & Arithmetic Square Roots on the Number Line – Construction and Approximation Construct √2 as the diagonal of a unit square, then chain right triangles with leg 1 to build √3, √4, … √n (the Theodorus spiral), and... Ages 12–13
Mathematics · Numbers & Arithmetic Rounding decimals on a number line A decimal number sits on two number lines: the top one is marked off by the rounding place, and the bottom one zooms into the interval... Ages 11–12
Mathematics · Numbers & Arithmetic Fraction models – comparing and adding Two fractions are shaded on a bar or circle model. Tap the parts to change the numerator and use the buttons to change the denominator.... Ages 11–12
Mathematics · Numbers & Arithmetic Sieve of Eratosthenes – finding prime numbers A grid of numbers from 1 to N. Each time you click 'Next step', the smallest unmarked prime is highlighted in blue and its multiples are... Ages 11–12
Mathematics · Numbers & Arithmetic Adding and subtracting integers on a number line A number line with two arrows: the blue arrow goes from 0 to a, and the red arrow continues b steps further (to the right for adding a... Ages 11–12
Mathematics · Numbers & Arithmetic Rational numbers on a number line – comparing and zooming in Two rational numbers a and b (entered as p/q or a decimal) are marked on a number line; the zoomed-in axis below is divided by their... Ages 12–13