lesson
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Imagine a rocket countdown that moves twice as fast: 10, 8, 6, 4, 2, 0... blast off!
How did the rocket skip numbers on the way down?
Stepping Back by Twos
When you count backwards by twos, you subtract 2 on every jump and skip the number in between.
You will always land on an even number — a number that ends in 0, 2, 4, 6, or 8.
📊A colorful horizontal number line from 0 to 10 designed for primary school kids. Large number circles for even numbers (0, 2, 4, 6, 8, 10) in vibrant blue (#22b7ff) with bold white text. Odd numbers (1, 3, 5, 7, 9) are smaller, muted gray (#cbd5e1). Curved backwards jump arrows bounce backwards from 10 to 8, 8 to 6, 6 to 4, 4 to 2, and 2 to 0. Each arrow is labeled '-2' in bright orange. An animated little frog or marker hops smoothly along each jump in a looping animation.
What happens when we start from a bigger number like 20?
The Repeating Digit Pattern
Watch the last digit as you step down from 20: 20, 18, 16, 14, 12, 10.
The ones digits follow a repeating backwards pattern: 8, 6, 4, 2, and then 0!
📊A visual stepping stone path going downwards from top to bottom. Two columns comparing tens: Left column has 20, 18, 16, 14, 12, 10. Right column has 10, 8, 6, 4, 2, 0. In every number, the ones digit is highlighted in a vibrant coral-orange circle so students clearly see the matching sequence: 0 -> 8 -> 6 -> 4 -> 2 -> 0. Clean rounded cards, soft drop shadows, large child-friendly font.
Can you jump backwards even if you start in the middle?