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Memorize your times tables so well you could do math in your sleep or pay your taxes before the IRS throws you in a tax jail.
My math teacher said if I didn't nail my numbers, I'd end up in the math penitentiary.
I multiplied 7 by 8 and got 56. Then I remembered I still owed the government $200.
Nail your numbers or be nailed by the IRS, it's the same thing.