To use Pho.to to add a double exposure effect, you need to open the official website and upload your images. You can choose them from your computer, by URL, or from Facebook.

In addition to announcing and detailing Halo 4's new Team Doubles playlist, 343 also revealed two new specializations will be added to the mix next week. They are Rogue and Tracker.

So I have a few more such posts coming up soon, starting with this one. The 6-year old brought this home on Monday. Click to enlarge: It’s about adding “near doubles”, like 3 + 4 or 2 + 3.

10 + 10 = 20 9 is 1 less than 10, so take this away. 20 – 1 = 19 That leaves the 12. It is 2 more than 10 so you need to add this on. 19 + 2 = 21 You’ve just worked out that 9 + 12 = 21.

Using near doubles is a maths strategy that can help you add numbers that are close to each other. Learn more with Bitesize First and Second Level Maths.