Looking at the pattern, fill in the gaps in the following:

A piece of land is in the shape of a square and its area is 1000 m². This has to be fenced using barbed wire. The barbed wire is available only in integral lengths. What is the minimum length of the barbed wire that has to be bought for this purpose?

A student was asked to final √961. He read it wrongly and found √691 to the nearest integer. How much small was his number from the correct answer?

Find the cubes of the first five odd natural numbers and the cubes of the first five even natural numbers. What can you say about the parity of the odd cubes and even cubes?

How many perfect cubes you can find from 1 to 100? How many from –100 to 100?