Fun with Numbers
Special numbers
There are four numbers in this box.
Which number looks special to you? Why do you say so?
| 9 | 16 |
|---|---|
| 25 | 43 |
Look at what Guna's classmates have to share:
• Karnawati says, "9 is special because it is a
• Gurupreet says, "9 is special because it is the only number that is a
• Murugan says, "16 is special because it is the only even number and also the only
• Gopika says, "25 is special as it is the only
• Yadnyikee says, "43 is special because it is the only
• Radha says, "43 is special because it is the only number that
Below are some boxes with four numbers in each box. Within each box try to say how each number is special compared to the rest. Share with your classmates and find out who else gave the same reasons as you did. Did anyone give different reasons that may not have occurred to you?
Box 1:
| 5 | 7 |
|---|---|
| 12 | 35 |
Answer:
Box 2:
| 3 | 8 |
|---|---|
| 11 | 24 |
Answer:
Box 3:
| 27 | 3 |
|---|---|
| 123 | 31 |
Answer:
Box 4:
| 17 | 27 |
|---|---|
| 44 | 65 |
Answer:
A prime puzzle
The figure on the left shows the puzzle. The figure on the right shows the solution of the puzzle. Think what the rules can be to solve the puzzle.
Rules
Fill the grid with prime numbers only so that the product of each row is the number to the right of the row and the product of each column is the number below the column.