Tap two numbers that make the target. Clear the board before the timer runs out and a harder one appears.
Number bonds (pairs that make 10, 20, 100 and so on) are the foundation of fast mental arithmetic. A child who just knows 37 + 63 makes 100 doesn't have to work it out, which frees their brain for the harder parts of an 11+ maths question. Games like this build that instant recall through sheer happy repetition.