No.1 download

"A simple arithmetic No1 mind works."
A simple mental arithmetic No1 studies. "1", "operators as a result of changing the expression of the +, -, ×, ÷". These operators can be changed by clicking. Example
for
2 7 9 4 = 1
2 × 7-9-4 = 1 can free download should be changed to No. 1 1.0.