Решение:
а) 28 ⋅ 3245
$$ 28 \times 3245 = 90860 $$
б) 187 ⋅ 408
$$ 187 \times 408 = 76300 + 5610 + 1500 + 240 = 76300 + 7350 = 83650 $$
в) 360 ⋅ 24500
$$ 360 \times 24500 = 36 \times 245 \times 1000 $$
$$ 36 \times 245 = 36 \times (200 + 40 + 5) = 7200 + 1440 + 180 = 8820 $$
$$ 8820 \times 1000 = 8820000 $$
г) 2666 : 43
$$ 2666 \div 43 = 62 $$
д) 16632 : 54
$$ 16632 \div 54 = 308 $$
е) 186000 : 150
$$ 186000 \div 150 = 18600 \div 15 = 1240 $$
Ответ: а) 90860; б) 76300; в) 8820000; г) 62; д) 308; е) 1240.