Subtraction Speed Grid Challenge
Speed Grid Challenge puts you up against the clock in a test of your subtraction skills.
You choose how many questions you have to answer and how long to answer them in, and then your challenge is under way.
This interactive exercise presents you with a grid of 16 different numbers and challenges you to take one from another to reach a target number.
The puzzles deal with subtraction of up to double digits, so it’s a useful test for kids in second and third grade.
There may well be different ways to reach the number – but as long as you hit the target, you’ll be able to move on to the next question. A wrong answer will see you being told to try again, and slowing down your attempt to beat the clock. See how many answers you can get right before the buzzer sounds.