Quarter and Half Turns
Turning is a thing you can measure
The year's last measurement is the sneakiest: not length, not time, but rotation. The descriptor asks children to identify, describe and demonstrate quarter, half, three-quarter and full turns in everyday situations — and every one of those words is a fraction of a circle, the very circle the fractions unit shaded and the clock unit swept. A turn is an amount, it has a size, and the size has a name: that is the whole idea, and the body is the best instrument for measuring it.
Four landmarks on one circle
The dial gives the four turns their places: a quarter sweeps one corner of the circle, a half faces you exactly backwards, three quarters leaves just one corner to go, and a full turn brings the arrow home with the whole circle shaded behind it. Children should stand up and be the arrow — the descriptor's demonstrate is meant literally — because the feeling of facing backwards after a half turn anchors the word better than any diagram can.
Named after the clock
A turn has a size and also a direction, and the directions borrow their names from the previous unit: clockwise is the way every clock's hands travel, anticlockwise is the rebel direction against them. In Australia we say anticlockwise where some countries say counterclockwise — same idea, same clock. The deep fact hiding in the toggle is undoing: a quarter turn one way is cancelled by a quarter turn the other, which is a child's first taste of an inverse operation, wearing a costume.
The room is the protractor
Inside a room, turns become visible without any numbers: face the whiteboard, make a half turn, and the bins are suddenly in front of you. This is the pathways unit returning — turn right there was always a quarter turn clockwise here — and it is the cheapest classroom equipment in mathematics: a child, a room, and four things to face. Families can play it at home with the fridge, the window, the couch and the door, one spinner and one caller at a time.
Reading turns off the world
Once the names exist, turns appear everywhere: a tap opens with about a half turn, a door handle drops through a quarter, a jar lid spins through several fulls, and the minute hand performs a perfect full turn every hour. Naming the turn an object makes is the descriptor's identify and describe in the wild, and the pale-to-dark arrows in the game train exactly that eye: where did it start, where did it stop, and how much circle lies between.
Turns that add up
The wind-up robot only turns one way, so reaching an exit on the left takes either one three-quarter turn or a quarter pressed three times — and discovering that those are the same thing is discovering that turns compose: quarters add to halves, halves to fulls, exactly as fractions do. With that, the measurement strand closes and so does Year 2 itself. After a year of tens and arrays, clocks and calendars, maps and graphs, the year ends facing the way it began — a full circle.