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Yohaku 3 by 3 Puzzles

Fill in the blank spaces so that the cells give the sum or the product shown in each row and column.

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This is level 6: multiplication with multiples, primes and factors. You will be awarded a trophy if you get at least 5 of the puzzles correct and you do this activity online.

1
486
162
324
486 162 324 ×

Use only multiples of 3

2
12348
20580
34300
27440 20580 15435 ×

Use only multiples of 7

3
70
8
70
8 70 70 ×

Use only prime numbers

4
4913
3971
5491
5491 3179 6137 ×

Use only prime numbers

5
130
2783
609
2093 165 638 ×

Use only prime numbers

6
7429
4199
14297
11339 6137 6409 ×

Use only prime numbers

7
288
384
48
96 48 1152 ×

Use only factors of 24

8
200
3000
1600
500 4800 400 ×

Use only factors of 60

Check

This is Yohaku 3 by 3 Puzzles level 6. You can also try:
Level 1 Level 2 Level 3 Level 4 Level 5

Instructions

Try your best to answer the questions above. Type your answers into the boxes provided leaving no spaces. As you work through the exercise regularly click the "check" button. If you have any wrong answers, do your best to do corrections but if there is anything you don't understand, please ask your teacher for help.

When you have got all of the questions correct you may want to print out this page and paste it into your exercise book. If you keep your work in an ePortfolio you could take a screen shot of your answers and paste that into your Maths file.

Why am I learning this?

Mathematicians are not the people who find Maths easy; they are the people who enjoy how mystifying, puzzling and hard it is. Are you a mathematician?

Comment recorded on the 28 May 'Starter of the Day' page by L Smith, Colwyn Bay:

"An absolutely brilliant resource. Only recently been discovered but is used daily with all my classes. It is particularly useful when things can be saved for further use. Thank you!"

Comment recorded on the 23 September 'Starter of the Day' page by Judy, Chatsmore CHS:

"This triangle starter is excellent. I have used it with all of my ks3 and ks4 classes and they are all totally focused when counting the triangles."

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Description of Levels

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2 by 2 Puzzles - A good place to start before takling these three by three monsters!

Set 1 - Addition with some numbers given

Set 2 - Addition with consecutive numbers

Set 3 - Addition with multiples, primes and factors

Set 4 - Multiplication with no restrictions

Set 5 - Multiplication with consecutive numbers

Set 6 - Multiplication with multiples, primes and factors

4 by 4 Puzzles - You must be joking - four by four - really?

More Puzzles - A huge collection of mathematical puzzles for you to enjoy.

Answers to this exercise are available lower down this page when you are logged in to your Transum account. If you don’t yet have a Transum subscription one can be very quickly set up if you are a teacher, tutor or parent.

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Answers to this exercise are available lower down this page when you are logged in to your Transum account. If you don’t yet have a Transum subscription one can be very quickly set up if you are a teacher, tutor or parent.

Log in Sign up

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