Which of these are multiples of 2? 20 455 352 495 462 909

Silvia visits her grandmother every 8 days and her brother Alberto every 14 days. When will they visit each other again? How many visits will each of them have made to their grandmother?

Which of these are multiples of 5? 120 455 352 495 462 909

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

Calculate and write, step by step, the process for arriving at the solution.

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

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

Calculate: máx.c.d. (60, 72, 84)

Is the number 64 a multiple of 4? Explain.

Is the number 155 a multiple of 31? Explain.

Calculate and write, step by step, the process for arriving at the solution. 81 : [(16 · 4 – 5 · 8)2 : (12 – 4)2]

Calculate: mín.c.m. (12, 24, 36)