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 Depdendent Variable

 Number of equations to solve: 23456789
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 Dependent Variable

 Number of inequalities to solve: 23456789
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# Multiplying by 572

To multiply a multiple of 7 by 572, perform the following:

• Divide the number by 7.

• Multiply the number by 4.

• Write the result on the right, using three digits. Then write the result on the left.

Example:

21 Ã— 572 =

Solution:

• 21 Ã· 7 = 3

• 3 Ã— 4 = 8

• Write 008 as 8 is the result and you must use three-digits. Then write the 8 on the left. The final answer is 8008.

21 Ã— 572 = 8008.

Example:

84 Ã— 572 =

Solution:

• 84 Ã· 7 = 12

• 12 Ã— 4 = 48

• Write 048 on the right (using three digits). Then write 48 on the left. The final answer is 48048.

Note: This trick works because .