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Use number lines to find equivalent fractions. 1 fourth is how many twelfths? Partition the distance from 0 to 1 into fourths. Make 12 twelfths by dividing each fourth into 3 equal parts. 1 fourth is 3 times 1 twelfth, so 1/4 = 3/12. Shortcut? Multiply numerator and denominator by 3. Get 3 times as many pieces that are 1/3 the size.