To divide by a fraction, use the Keep, Change, Flip method: Keep the first fraction unchanged, Change the division to multiplication, and Flip the second fraction to its reciprocal (swap numerator and denominator). For example, 2/3 ÷ 5/7 becomes 2/3 × 7/5 = 14/15.
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Dividing Fractions — Keep, Change, Flip (Grade 7) #Shorts追加:
Divide by a fraction. Don't panic. Keep change. Flip. One simple trick. 2/3 divided by 57th. Keep 2/3. Change two times. Flip. 57th becomes 7 fths.
Multiply across. 14 15. Full lesson in bio.
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