Interactive Multiplication Chart – Online Highlight Patterns
Click cells to see patterns, highlight multiples. Visual way to learn multiplication. Print empty grid.
UD5 Toolkit
Fill the Times Table – sharpen your mental math skills
Click cells to see patterns, highlight multiples. Visual way to learn multiplication. Print empty grid.
Practice mental arithmetic with customizable operators and digit count. Timed rounds, score tracking. Works offline. Improve your brain speed.
Generate a sheet of random arithmetic problems (+, -, ×, ÷) with configurable digits. For kids and brain training.
Solve random arithmetic problems under a time limit. Track your score and improve mental calculation. No data collected.
Test how fast you can convert between binary and decimal. Timed drills with increasing difficulty. Learn base‑2 fluency.
Answer a series of deliberately confusing and trick questions. Lives system and funny wrong answers. Playful, no data stored.
Drag pie slices to represent fractions and see them added together. Great for visual learners.
Random shapes appear; compute the area mentally. Multiple choice. For middle schoolers.
Enter roof line or tree height and get the length of light strings needed. Estimate power draw.
Estimate make probability of a putt based on distance and skill rating. For disc golf enthusiasts. Fun statistical tool, no data upload.
Paste a list of ingredients with quantities and scale them up or down by a factor. Handles fractions. Cooking helper.
Determine what score you need on your final exam to achieve your target overall grade. Enter current grade, weight, desired grade. Local only.
Enter number of eyelet pairs and lacing style to find the correct shoelace length in inches/cm. Never buy too short.
Compute probability for simple events, as well as permutations and combinations (nPr, nCr). Useful for statistics and game theory. Browser-based math.
Click grid to place beads, choose colors, generate a loom pattern. Download as image.
Enter an original pan size and find an alternative pan with the same batter volume. Never overflow or underfill.
Type a mathematical expression like 'sqrt(16)+sin(pi/2)' and get the result instantly. Supports popular functions. Local.
Calculate the area of an irregular polygon by entering its vertex coordinates. Uses the shoelace formula. Pure math.
Measure window width and get rod length and number of curtain panels for proper fullness.
Enter mold dimensions or water weight to get total resin needed, including Part A and B.
Translate hexadecimal numbers to decimal integers. Instantly see the magnitude. A simple, private utility for developers and mathematicians.
Calculate board feet for dimensional lumber and generate a cut list with waste factor. Quick carpentry tool.
Check if your A/B test results are statistically significant using chi-squared test. Enter visitors & conversions for control/variant. Results in plain English.
Build a combination resistor network by adding series/parallel groups and get total resistance. Visual circuit.
Type a word and see if it can be spelled using chemical element symbols. Geeky custom message creator. Copy or share.
Calculate the total resistance of up to 10 resistors in parallel. Enter values and see the combined resistance instantly. Local electronics helper.
Convert currencies using a built‑in table of approximate fixed rates. Useful for quick estimates without live data. Local.
Convert annual salary to effective hourly rate considering holidays, vacation, and work hours per week.
Draw perfect ellipses by dragging focal points and a point on the curve. See the equation update dynamically. Educational.
Try to draw a perfect circle freehand. Score based on roundness. Fun and addictive. No data sent.