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Cross multiplying is a strategy for finding the missing part of a set of equivalent fractions.

Cross multiplying is a strategy for finding the missing part of a set of equivalent fractions. The letter a is supposed to represent the number you don’t know yet. It is called a variable. 1. 5. =. 2. a. Use that brain in your head: If 10 is 1 times some number,

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Cross multiplying is a strategy for finding the missing part of a set of equivalent fractions.

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  1. Cross multiplying is a strategy for finding the missing part of a set of equivalent fractions. The letter a is supposed to represent the number you don’t know yet. It is called a variable. 1 5 = 2 a

  2. Use that brain in your head: If 10 is 1 times some number, what is that number? The letter a is supposed To represent the number You don’t know yet. It is called a variable. Cross multiplying is a strategy for finding the missing part of a set of equivalent fractions. 1 5 = 2 a 2 x 5 = 1 x a = 1 x a 10

  3. Yes. Since 10 = 1 x 10, the variable a in this case is 10. 1 5 = 2 a 10 2 x 5 = 1 x a = 1 x a 10

  4. If 84 is three times some number, then 84 ÷ 3 will reveal the missing amount. 3 12 = 7 a 7 x 12 = 3 x a 84 = 3 x a

  5. If 84 is three times some number, then 84 ÷ 3 will reveal the missing amount. 2 8 8 4 3 6 3 12 2 4 = 2 4 7 a 0 7 x 12 = 3 x a 84 = 3 x a

  6. If 84 is three times some number, then 84 ÷ 3 will reveal the missing amount. 2 8 8 4 3 6 3 12 2 4 = 2 4 7 a 28 0 7 x 12 = 3 x a 84 = 3 x a

  7. (6 x 2) +3=15 6 0 6 0 15 b __ __ 25 1500 = 3 25 100 15 0 0 0 25 x b 15 x 100 = 0 1,500 ÷ 25 = b 0 6 0 = b

  8. 66.6 6 6 6 8 n 12 8 0 0 0 = 72 12 100 8 0 72 800 12 n = 8 0 n 800 /12 = 7 2 n 66.6 =

  9. A LOT OF STEPS!

  10. Soon you will know how to solve even harder problems!

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