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Jill wrote the number 40 if her rule is add 7 , what is the fourth number in Jill's pattern,how can you check your answer

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PhyCS
The first number is 40. The second, third, and fourth number each add 7, so we have 3 steps to get to the fourth step, so we must add 7 *3 = 21 to 40, which is 61.
Leader
You just keep adding 7 to the first number.
First number is 40.
Second number is 40+7 which is 47.
Third number is 47+7 which is 54.
Fourth number is 54+7 which is 61.

Or you could do 7 X 3 = 21 and add that to 40.
The answer is 61.

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