Video narration
Your fingers pop up beside a big six-ready to count? Keep six in your head, and show three on your fingers. Start at six; don't count it again. Count three more with me, here we go, nice and clear: seven, eight, nine! Six plus three makes nine. Clap, clap! Now let's try a bigger sum: thirty-three plus twelve. Write thirty-three above twelve, with the numbers stacked neatly. Ones, the right-hand digits, go under ones; tens, the left-hand digits, go under tens. Line them up! First, add the ones: three plus two equals five. Now add the tens: three plus one equals four. The five ones and four tens make forty-five: thirty-three plus twelve equals forty-five! That finger trick was for our first sum; here, the lined-up columns do the work. Remember: BIG IN YOUR HEAD, SMALL ON YOUR FINGERS!