Practise, with the steps shown.

Reveal one hint at a time, or jump straight to the answer. Each exercise links to the technique it belongs to.

Compute 35²
Compute 65²
Compute 145²
Compute 21 × 32
Compute 56 × 47
Compute 96²
Compute 108²
Compute 62 × 68
Compute 81 × 89
Compute 56 × 99
Compute 783 × 999
Solve: 5x − 3y = 11 ; 3x − 5y = 1