Add or Subtract
4, ___, 12, ____, 20
Find the missing numbers
8 and 16
Term-to-term rule is Add 4
100, 50, 25, __
What is the missing number?
12.5
Term-to-term rule is Divide by 2
3, 9, 27, 81
What is the term-to-term rule?
Multiply by 3
6, 10, 15, 20, 25
Which term is wrong?
6 (correct term is 5)
Term-to-term rule is Add 5
The 5th term in a sequence is penxxxxx. What is the 10th term?
Decagon
100, 97, ___, 91, ____
What are the missing numbers?
94 and 88
Term-to-term rule is Subtract 3
Term-to-term rule: Multiply by 3 then subtract 1.
The first term is 2. What is the next 3 terms?
5, 14, 41
2, 5, 11, 23, 47, 95
What is the term-to-term rule?
Multiply by 2 then add 1
5, 11, 24, 47, 95
Which term is wrong?
24 (should be 23)
(term to term rule is Multiply by 2 then add 1)
Sequence ends at 256. Term to term rule is multiply by 2. What was the first term if there are 5 terms?
16
16 → 32 → 64 → 128 → 256
-18, ___, -10, ___,
Find the missing terms
-14 and -6
Term-to-term rules Add 4
729, 243, 81, ___, ___
What is the next 2 terms?
27 and 9
Term-to-term rule is Divide 3
2, 3, 6, 15, 42, 123
What is the term-to-term rule?
Multiply by 3 then subtract 3
3, 11, 48, 192, 768
Which term is wrong?
11 (should be 12)
(Term to term rule is multiply by 4)
Amy collects seashells.
On the first day, she collects 2. Each day, she collects 3 more than the day before.
How many seashells does she collect on the 5th day?
14
Sequence: 2, 5, 8, 11, 14
The sequence starts at 2. Add 3 more each time. What’s the 6th term?
17
2, 5, 8, 11, 14, 17
Term to term rule: Multiply by 2, then subtract 1.
The first term is 1. What is the 5th term?
1
1, 1, 1, 1, 1
1, 5, 21, 85, 341, 1365
What is the term-to-term rule?
Multiply 4 then add 1
4, 9, 16, 26, 36
Which number is wrong?
26 (supposed to be 25)
The terms are squared numbers
A bus picks up 5 people at the first stop, 10 at the second, and 15 at the third.
How many will it pick up at the 6th stop?
30
Sequence: 5, 10, 15, 20, 25, 30
1, 4, 9, 16, ___ → What’s the 10th term?
100
1, 4, 9, 16, 25, 36, 49, 64, 81, 100
Each term is squared numbers
Last term is 243. The term-to-term rule is Multiply 3. What is the first of 5 terms?
3
3, 9, 27, 81, 243
1000, 252, 65, 18.25
What is the term-to-term rule?
Divide by 4 then plus 2
2, 6, 30, 14, 62
Which terms are wrong?
30 and 14. They are swapped!
Term to term rule is Multiply 2 then Add 2.
Jason builds a pyramid with balls.
Each layer has one more ball than the layer before it.
If he uses 1 ball for the top layer, then 3, then 6, then 10...
How many balls will he use for the 5th layer?
15
Sequence: 1, 3, 6, 10, 15