Is the number 155 a multiple of 31? Explain.

Calculate and write, step by step, the process for arriving at the solution. (50 : 5 – 23 )2 + 3 · (6 · 3 – 4 · 4)3

Which of these are multiples of 11? 120 455 352 495 462 909

One comet is visible from Earth every 24 years and the other every 36 years. The last year they were visible together was 1944. In which year will they coincide again?

Which of these numbers is a divisor of 48? 20 11 16 9

Is the number 64 a multiple of 4? Explain.

Which of these numbers are multiples of two and three at the same time? 120 455 352 495 462 909

Calculate and write, step by step, the process for arriving at the solution. 92 : (62 – 52 + 4 · 7 – 24)

Calculate and write, step by step, the process for arriving at the solution.                                   [(56 : 7 – 6)3 + 4]2 : (8 – 5)2

Is the number 6 a divisor of 30? Explain why.

Calculate: mín.c.m. (12, 24, 36)

The bus on line A passes a certain stop every 12 minutes, the bus on line B passes every 18 minutes, and the bus on line C passes every 24 minutes. If they all coincide at 10 a.m., at what time do they coincide again?