Mental Math/●●●●●Sum the integers from 1 to 100seriesarithmetic-seriesSolve in your head. What is 1+2+3+⋯+1001 + 2 + 3 + \dots + 1001+2+3+⋯+100? Aim: under 5 seconds. Follow-up: what is 2+4+6+⋯+2002 + 4 + 6 + \dots + 2002+4+6+⋯+200?Your answerCheckMore Mental Math questionsTurn 0.375 into a simple fractionEstimate 1.015 to the 12th powerEstimate 0.99 to the 20th powerEstimate 1.05 to the 8th powerAll questions →
