Sequences / Skips up to 10,000: Increases of fifths/tens

Examples with solutions for Sequences / Skips up to 10,000: Increases of fifths/tens

Exercise #1

Complete the sequence:

995, 1,000, 1,005,  995,\ 1{,}000,\ 1{,}005, \ \ldots

Step-by-Step Solution

To solve this problem, let's follow these steps:

  • Step 1: Calculate the differences between consecutive terms of the sequence.
  • Step 2: Use the common difference to find the next terms.
  • Step 3: Verify the result with the provided answer choices.

Step 1: Calculate the differences:
The difference between the first and second terms is 1000955=451000 - 955 = 45.
The difference between the second and third terms is 10051000=51005 - 1000 = 5.

Step 2: Identifying that the sequence alternates increases, first by 45 and then by 5, we predict it continues by adding 5. Thus, extending the sequence, the next terms would be:
1005+5=10101005 + 5 = 1010,
1010+5=10151010 + 5 = 1015,
1015+5=10201015 + 5 = 1020.

Therefore, the next terms in the sequence are 1010,1015,1020 1010, 1015, 1020 .

Step 3: Verify against provided answer choices. The correct choice is:

1010,1015,10201010,1015,1020

The next numbers in the sequence are 1010,1015,1020 1010, 1015, 1020 .

Answer

1,010, 1,015, 1,020 1{,}010,\ 1{,}015,\ 1{,}020

Exercise #2

Complete the sequence:

4,580, 4,570 4,560,  4{,}580,\ 4{,}570\ 4{,}560, \ \ldots

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Identify the difference between each given term in the sequence.
  • Step 2: Confirm this difference is consistent across the initial sequence.
  • Step 3: Use this pattern to determine the next terms.

Now, let's work through each step:

Step 1: Calculate the difference between the first two terms: 45804570=10 4580 - 4570 = 10 .

Step 2: Confirm the difference between the next terms is the same: 45704560=10 4570 - 4560 = 10 . This confirms a constant decrement of 10.

Step 3: Continue the sequence using this pattern:

  • The next term is 456010=4550 4560 - 10 = 4550 .
  • The following term is 455010=4540 4550 - 10 = 4540 .
  • The final term in this sequence is 454010=4530 4540 - 10 = 4530 .

The next three terms in the sequence are 4550,4540,4530 4550, 4540, 4530 .

Therefore, the correct answer according to the provided choices is: 4550,4540,4530 4550, 4540, 4530 , which corresponds to choice 4.

Answer

4,550, 4,540 4,530 4{,}550,\ 4{,}540\ 4{,}530