Ken's Puzzle of the Week
Third Grade Puzzles
I visited my son's class this year and shared
various puzzles every other week. Here's a compilation of some of
their favorites. Most will be familiar to the readers of this
site already, but I enjoyed revisiting some of these, so perhaps you
will, too. No need to send solutions. A DOC file with
solutions is provided.
- Mini-Sudoku – Place 1-3 in each row and column
- OTTFFSS. What letter comes next?
- Fifteen toothpicks in three squares, remove 6
to leave ten.
- 9 dots (3x3). Connect them with 4 straight
lines without lifting your pencil.
- 16 dots (4x4). Connect them with 6
straight lines, ending where you begin.
- You have a 3 and 5 gallon container. How
can you make exactly 4 gallons?
- Magic Square. Place 1-9 into a 3x3 grid
such that every row, column and diagonal sum to 15.
- Why is this a Christmas greeting?
- Persistence Numbers: Take a 2 digit number and
multiply its digits. Repeat until you reach a single digit. What
starting number requires the most steps?
- How many squares (of any size) are on a
- What is the most money you can have (in coins)
without having exactly $1?
- What numbers come next? 1, 0, 3, 11, 15, ?
- A bottle of soda costs $3. The soda is
worth $2 more than the bottle. How much is the bottle worth?
- There are 9 balls and one is slightly
heavy. Find it with only two weighings on a balance scale.
- Man, Grain, Goat, and Wolf, crossing a
river. The man may take only one of his possessions on each
trip. How does he do it without the goat eating the grain or the
wolf eating the goat?
- A lily in a pond doubles its size every
day. It takes 2 weeks to cover the pond. When is the pond
- Place 8 queens on a chessboard, such that no
queen attacks any other.
- How many flowers do I have if all of them are
roses except two, all of them are tulips except two, and all of them
are daisies except two? [Two answers.]
- 3 hens can lay 3 eggs in 3 days. How long
will it take 6 hens to lay 6 eggs?
- Place only 4 marks on a 12-inch ruler to be
able to measure 1 to 12 inches.
- Use six toothpicks to make four equilateral
- deft, laughing, hijack, calmness, canopy, [?],
stump. What word could be [?]
- Two days ago I was 29. Next year I will
be 32. When is my birthday?
- A clock’s hands are at a right angle how many
times between noon and midnight?
- A snail climbs up 3 feet every day and slips
down 2 feet each night. How long until he exits a 10 foot well?
Source: Various puzzle sources. Here is a Word DOC file with puzzles and
Solutions are in DOC file