a) 13 105 × 3 + 1 230 × 4 + 1 005 b) 18 560 – (680 + 130) × 2 c) 23 645 – 12 516 : 3 d) 340 × 5 : 4

a) 13 105 × 3 + 1 230 × 4 + 1 005

= 39 315 + 4 920 + 1 005

= 44 235 + 1 005

= 45 240

b) 18 560 – (680 + 130) × 2

= 18 560 – 810 × 2

= 18 560 – 1 620

= 16 940

c) 23 645 – 12 516 : 3

= 23 645 – 4 172

= 19 473

d) 340 × 5 : 4

= 1 700 : 4

= 425