1) 96 : 3 = 32 elevi merg intr-un autobuz
2) latimea = 153 m, L = 3 × 153 m = 459 m
Perimetrul dreptunghiului = 2 × L + 2 × latimea = 2 × 459 m + 2 × 153 m =
= 918 m + 306 m = 1 224 m
3)
a) 72 × 2 = ( 70 + 2) × 2 = 70 × 2 + 2 × 2 = 140 + 4 = 144
86 × 5 = ( 80 + 6 ) × 5 = 80 × 5 + 6 × 5 = 400 + 30 = 430
b ) 99 × 4 = ( 100 - 1 ) × 4 = 100 × 4 - 1 × 4 = 400 - 4 = 396
57 × 9 = ( 60 - 3) × 9 = 60 × 9 - 3 × 9 = 540 - 27 = 513
c) 128 × 6 = ( 100 + 20 + 8) × 6 = 100 × 6 + 20 × 6 + 8 × 6 =
= 600 + 120 + 48 =
= 768
459 × 9 = ( 400 + 50 + 9) = 400 × 9 + 50 × 9 + 9 × 9 =
= 3 600 + 450 + 81 =
= 4 050 + 81 =
= 4 131
d) 888 × 8 = ( 800 + 80 + 8 ) × 8 = 800 × 8 + 80 × 8 + 8 × 8 =
= 6 400 + 640 + 64 =
= 7 040 + 64 =
= 7 104
sau: ( 900 - 12) × 8 = 900 × 8 - 12 × 8 = 7 200 - 96 = 7 104
603 × 7 = ( 600 + 3 ) × 7 = 600 × 7 + 3 × 7 = 4 200 + 21 = 4 221
