Press space to progress. Select six of any combination large (25 50 75 100) and small (2 * 1 2 3 4 5 6 7 8 9 10) numbers. Reach the target using only + - * / You can only use each number once. No fractions or decimals, only integers. Sometimes the solution calculation "ai" takes a while and often shows off... but sometimes is wrong! https://www.maths-resources.com/countdown/ comes recommended to be sure :)
Credit to @WillJimbo and @gtoal