Multiplication and division

Each clue in this Sudoku is the product of the two numbers in adjacent cells.

Mathematicians are always looking for efficient methods for solving problems. How efficient can you be?

How many ways can you find to put in operation signs (+, −, ×, ÷) to make 100?

Gabriel multiplied together some numbers and then erased them. Can you figure out where each number was?

Aisha's division and subtraction calculations both gave the same answer! Can you find some more examples?

Take any four digit number. Move the first digit to the end and move the rest along. Now add your two numbers. Did you get a multiple of 11?

A monkey with peaches, keeps a fraction of them each day, gives the rest away, and then eats one. How long can his peaches last?

This Sudoku puzzle can be solved with the help of small clue-numbers on the border lines between pairs of neighbouring squares of the grid.

Here is a chance to play a fractions version of the classic Countdown Game.

Using the digits 1 to 9, the number 4396 can be written as the product of two numbers. Can you find the factors?