TRUE: ten + ten = twenty, twenty + thirty = fifty, thirty - ten = twenty, sixty + twenty = eighty, ninety + ten = one hundred, seventy - twenty = fifty, ten + twenty = thirty, twenty + eighty = one hundred, twenty + twenty = forty, sixty - thirty = thirty, FALSE: ten + ten = thirty, twenty + forty = seventy, thirty - thirty = sixty, ninety - thirty = fifty, ninety - eighty = twenty, seventy - thirty = ten, thirty + forty = ninety, sixty - fifty = ninety, forty - ten = twenty, thirty + fifty = one hundred,

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