Mental calculations

In Sam and Jill's garden there are two sorts of ladybirds with 7 spots or 4 spots. What numbers of total spots can you make?

Place the numbers 1 to 6 in the circles so that each number is the difference between the two numbers just below it.

Charlie and Abi put a counter on 42. They wondered if they could visit all the other numbers on their 1-100 board, moving the counter using just these two operations: x2 and -5. What do you think?

Use the information about Sally and her brother to find out how many children there are in the Brown family.

Can you put the numbers 1 to 8 into the circles so that the four calculations are correct?

In this twist on the well-known Countdown numbers game, use your knowledge of Powers and Roots to make a target.

Can you find all the ways to get 15 at the top of this triangle of numbers? Many opportunities to work in different ways.

Can you use the clues to complete these 6 by 6 Mathematical Sudokus?

Can you use the clues to complete these 3 by 3 Mathematical Sudokus?

Complete the Mathdoku grid using the clues. Can you convince us that the number you have chosen for each square has to be correct?