Sum Sprint

Sum Sprint is a one-minute mental math race. A sum pops up, three answers wait underneath, and the clock is ticking: pick the right one to keep your streak alive and watch your combo multiplier climb. Problems start with adding up to 10, then bring in subtraction and bigger numbers as you get more right, so it fits kindergartners and fifth graders alike.

How to play

• Press PLAY (or hit Enter) to start the 60-second sprint.
• Read the problem in the middle and pick the right answer from the three buttons.
• On a keyboard, press 1, 2 or 3 (or the left, down and right arrow keys). On a phone or tablet, just tap the button.
• Every correct answer in a row builds your streak. Every three in a row raise your multiplier, up to x5.
• A wrong answer shows the right one for a moment and resets your streak, so slow down a little if you keep missing.
• When the timer bar turns red you have five seconds left. Beat your best score!

What you’ll practice

• Addition facts within 10 and within 20
• Subtraction facts within 20 (never a negative answer)
• Adding and subtracting two-digit numbers within 50
• Quick recall and math fact fluency under a friendly time limit
• Spotting near-miss mistakes: off by one, off by ten, swapped digits, or the wrong operation