There are 525 pages in a book. julia and kim round the number of pages to the nearest ten. julia says it is 520. kim says it is 53 tens. who is correct. explain your thinking.

Abox contains 1 plain pencil and 4 pens. a second box contains 5 color pencils and 5 crayons. one item from each box is chosen at random. what is the probability that a plain pencil from the first box and a color pencil from the second box are selected? write your answer as a fraction in simplest form.

Which is greater, 7 p 5 or 7 c 5? 7p5 7c5

Two corresponding sides of two similar triangles are 3cm and 5cm. the area of the first triangle is 12cm2. what is the area of the second triangle?