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Specific Tricks

Level 18 / realistic untimed

Add via sub (4d + near-round)

3 visual steps / add near round

1. Use round

4567 + 99981. Use roundAdd the nearby round number.14567 + 100002remove 23answer 14565
Add the nearby round number.

Add the nearby round number.

2. Remove extra

4567 + 99982. Remove extraSubtract the extra amount.14567 + 100002remove 23answer 14565
Subtract the extra amount.

Subtract the extra amount.

3. Final answer

4567 + 99983. Final answerKeep the adjusted total. Read answer answer 14565Keep the adjusted total.
Keep the adjusted total.

Keep the adjusted total.

Practice Level 18

Name the shape first; the shortcut stays small.

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