Idea 14of 15Builds onUndo a move
Two moves in a row
How do you predict where a shape ends after two moves?
Today you'll discover
- how to do two moves one at a time
- when the order matters
- when it does not
Think firstA flag pointing right
The flag turns 90° clockwise, then flips across an upright line. Which way does it point?
Decide first, then press Next. Draw the first move before you make the second.
Four small grids, each with a faint outline of the starting flag, which points right. The second shows it turned 90 degrees clockwise, pointing down. The third shows that result flipped across an upright line: still pointing down, hanging off the other end. The fourth shows the moves the other way round, flip first then turn: it points up.
See the whole ideathe big idea and the key word, in one place
The big idea
Do two moves one at a time, in order; swapping the order can change the result.
Easy to get wrongDraw the shape after the first move before you start the second. Doing both in your head is where mistakes creep in.
Key word
- order
- which move comes first and which comes second
Ready to use it?
- Predict where a shape ends after two moves.
- Check whether swapping the order changes the result.