Take three hands-up answers, not open call-outs. Some pupils will guess 250 g or 25 g — leave every answer on the board and say you'll settle it by the end. Do not confirm the right answer yet; the ×1000 rule is what the lesson builds to.

The × 1000 chip sits between the kg and g rungs on each example — let the class read the rule off the screen.

2.5 kg → 2,500 g: friendly whole-times case, digits slide three columns left.

0.25 kg → 250 g: a decimal on the kg side, same rule holds.

75 g → 0.075 kg: going up the ladder, ÷ 1000, digits slide the other way. Hardest one — hold out for a pupil to notice the zero after the point before you name it.

Talk this one through together — pupils take turns at the board and the class agrees or corrects out loud.

The interactive is in guided mode: tap the destination rung and let the digits walk while the class names the rule. Order is deliberate: 1.75 kg → g is a clean × 1000; 500 g → kg lands on the friendly 0.5 kg (the number the wrap talks about); 0.4 kg → g checks the decimal-on-kg case; 8 g → kg is the tricky one — it gives 0.008 kg, three zeros work, so hold out for a pupil to say where the 8 lands.

This is the practice round — pupils take turns at the board, check each answer, and the class confirms before moving on. Keep the board work brisk rather than over-explaining.

The practice set climbs from a clean whole-number kg through decimals to the very small grams case. 6 g → kg = 0.006 kg is the hardest — two zeros after the point; ask the class to predict the digit's column before Check. Individual pupils type each answer; the interactive marks it ✓ or not-yet.