1) 56 + 88 + 44 = ( 56 + 44) + 88 = 100 + 44 = 144
2) 224×4×250 = (4×250) × 224 = 1000 × 224 = 224 000
3) 13245+8899-3245 = (13245-3245) + 8899 = 10 000 + 8 899 = 18 899
4) 87×33+13×33 = (87+13) × 33 = 100 × 33 = 3 300
5) 1555 - 234 - 766 = 1555 - (234 + 766) = 1 555 - 1 000 = 555
6) 1199×678-199×678 = (1199 -199) × 678 = 1 000 × 678 = 678 000
1) 56 + 88 + 44 = ( 56 + 44) + 88 = 100 + 44 = 144
2) 224×4×250 = (4×250) × 224 = 1000 × 224 = 224 000
3) 13245+8899-3245 = (13245-3245) + 8899 = 10 000 + 8 899 = 18 899
4) 87×33+13×33 = (87+13) × 33 = 100 × 33 = 3 300
5) 1555 - 234 - 766 = 1555 - (234 + 766) = 1 555 - 1 000 = 555
6) 1199×678-199×678 = (1199 -199) × 678 = 1 000 × 678 = 678 000