Adding larger numbers in your head is not always easy. If you need to use pen and paper, then the column method is a good way to add. It involves writing one number beneath the other, so that the ...

Let’s see if you’ve got enough. Why don’t you start by counting up the astro bugs? 1… 2… 3. Then the space grubs. That’s 1… 2… 3… 4… 5. Now all ...