Rounding Rodeo

What your child will figure out

• Locate a whole or decimal number between its two neighbouring multiples, then commit to a corral before seeing the distance explanation.
• Use distance from the midpoint to round whole numbers from the nearest 10 through the nearest 100,000.
• Apply the midpoint-up rule when a number sits exactly halfway between two choices.
• Transfer the same number-line reasoning to measurements, money, attendance, and decimals through thousandths in adaptive mixed practice.

The levels

1. First catch

   Rope 34 into 30, then see why the lower tens corral was nearer.

2. Bigger herd

   Round the larger number 146 to its nearer ten without extra prompts.

3. Hundred herd

   Scale the same physical number-line move to round 267 to the nearest hundred.

4. Halfway showdown

   Recognize that 35 sits exactly halfway and use the convention that halfway rounds up.

5. Close-call canyon

   Round 1,249 to the nearest hundred when it sits just below the midpoint.

6. Hundred halfway

   Apply halfway-up at a larger scale by rounding 6,550 to the nearest hundred.

7. Thousand trail

   Round an arena crowd of 14,499 to the nearest thousand.

8. Grand midpoint

   Use the midpoint convention to round 38,500 to the nearest thousand.

9. Ten-thousand stampede

   Round a herd count of 67,249 to the nearest ten thousand.

10. Big arena estimate

    Round an attendance estimate of 384,999 to the nearest hundred thousand.

11. Whole-mile marker

    Round a 12.46 km trail measurement to the nearest whole kilometre.

12. Tenths turn

    Round a supply weight of 8.74 kg to the nearest tenth.

13. Hundredths hitch

    Round a $42.195 supply cost to the nearest hundredth using halfway-up.

14. Precision finals

    Round a 7.3055 km course time to the nearest thousandth using the same midpoint rule.