Răspuns:
a) 312 × 3 = ( 300 + 10 + 2 ) × 3 = ( 300 × 3 ) + ( 10 × 3 ) + ( 2 × 3 ) = 900 + 30 + 6 = 936
b) 175 × 8 = ( 100 + 70 +5) × 8 = ( 100 × 8 ) + ( 70 ×8) + ( 5 × 8 ) = 800 + 560 + 40 = 1400
c) 692 × 5 = ( 600 + 90 + 2 ) × 5 = ( 600 × 5 ) + ( 90 × 5 ) + ( 2 × 5 ) = 3000 + 450 +10 = 3460