If the star multiplied by △ equals 60, then (Star multiplied by 8) multiplied by △ equals (); if the star multiplied by △ equals 300, then (Star multiplied by 2) multiplied by (△ multiplied by 5) equals ()

If the star multiplied by △ equals 60, then (Star multiplied by 8) multiplied by △ equals (); if the star multiplied by △ equals 300, then (Star multiplied by 2) multiplied by (△ multiplied by 5) equals ()

This is about the law of combination of multiplication and the law of commutation;
(STAR * 2) * (△ 5) = STAR * △ 2 * 5 = 3000

What is 12356 + 89 + 154

12356+89+154=12599

1024 minus at least______ It's a multiple of three, 1708 plus at least______ It's a multiple of five

(1) 1 + 0 + 2 + 4 = 7, 6 is a multiple of 3, so you should at least subtract: 7-6 = 1, (2) 1708 bits are 8, only when the single digit is 0 or 5, can be divided by 5; so at least add 2; so the answer is: 1, 2