Maximum Single Digit Mental Arithmetic Addition and Subtraction Problems (8 Rows) Solved in 5 Minutes by an Individual (Female)

Maximum Two Digit Mental Arithmetic Subtraction Problems (2 Rows) Solved in 5 Minutes by an Individual (Female)

Fastest Time to Repeatedly Subtract a Single Digit Number 100 times from a Larger Number by an Individual (Male)

Maximum Single Digit Mental Arithmetic Addition Problems (5 Rows) Solved in 7 Minutes by an Individual (Female)

Maximum Two Digit Mental Arithmetic Multiplication Problems (2 Rows) Solved in 5 Minutes by an Individual (Male)

Fastest Time to Solve 100 Single Digit Addition Problems (4 Rows) using Abacus by an Individual (Male)