Next number? 🔢

$$2,\ 8,\ 14,\ 20,\ \ldots$$

Next number? 🔢

$$11,\ 15,\ 19,\ 23,\ \ldots$$

Sum it up ➕

$$1 + 2 + \cdots + 7 = \;?$$

Sum it up ➕

$$1 + 2 + \cdots + 17 = \;?$$

🧱 In a brick stack, the bottom row has 30 bricks and each row above has 2 fewer.

How many bricks are in the 8th row?

Next number? 🔢

$$2,\ 11,\ 20,\ 29,\ \ldots$$

Sum it up ➕

$$1 + 2 + \cdots + 16 = \;?$$

Next number? 🔢

$$7,\ 9,\ 11,\ 13,\ \ldots$$

What comes next? 🔁

$$4,\ 12,\ 36,\ 108,\ \ldots$$

Next number? 🔢

$$11,\ 18,\ 25,\ 32,\ \ldots$$

Next number? 🔢

$$9,\ 14,\ 19,\ 24,\ \ldots$$

🟩 What is the sum of the even numbers from 2 to 100 ($2 + 4 + \cdots + 100$)?

Next number? 🔢

$$1,\ 10,\ 19,\ 28,\ \ldots$$

Next number? 🔢

$$9,\ 13,\ 17,\ 21,\ \ldots$$

What comes next? 🔁

$$2,\ 6,\ 18,\ 54,\ \ldots$$

What comes next? 🔁

$$3,\ 9,\ 27,\ 81,\ \ldots$$

What comes next? 🔁

$$3,\ 6,\ 12,\ 24,\ \ldots$$

➕ What is $1 + 2 + 3 + 4 + \cdots + 40$?

Sum it up ➕

$$1 + 2 + \cdots + 20 = \;?$$

Next number? 🔢

$$6,\ 12,\ 18,\ 24,\ \ldots$$

Next number? 🔢

$$4,\ 10,\ 16,\ 22,\ \ldots$$

🔢 What is the next term: 2, 5, 8, 11, ...

Next number? 🔢

$$10,\ 16,\ 22,\ 28,\ \ldots$$

Next number? 🔢

$$11,\ 16,\ 21,\ 26,\ \ldots$$

What comes next? 🔁

$$2,\ 4,\ 8,\ 16,\ \ldots$$

Next number? 🔢

$$3,\ 10,\ 17,\ 24,\ \ldots$$

What comes next? 🔁

$$1,\ 3,\ 9,\ 27,\ \ldots$$

Sum it up ➕

$$1 + 2 + \cdots + 6 = \;?$$

Next number? 🔢

$$2,\ 9,\ 16,\ 23,\ \ldots$$

What comes next? 🔁

$$4,\ 8,\ 16,\ 32,\ \ldots$$

What comes next? 🔁

$$1,\ 2,\ 4,\ 8,\ \ldots$$

Sum it up ➕

$$1 + 2 + \cdots + 12 = \;?$$

🔁 What is the next term: 3, 6, 12, 24, ...

🔢 The 10th term of 3, 7, 11, 15, ... is?

➕ What is the sum of the first 20 odd numbers ($1 + 3 + 5 + \cdots$)?

🔁 In the geometric sequence 2, 6, 18, 54, ... the 6th term is?