One way would be to work out 10 × 7 and 5 × 7 and then add them together. Any combination of facts would work, as long as the total number of weeks is 15. Both 630 and 70 are ten times greater ...

Explore the different ways to count up and down by 3. The 3 times table Learn the three times table and its division facts. Multiplying and dividing by three Use your knowledge of the three times ...