Jolly Postman in a Pickle!

Help the Jolly Postman sort these envelopes. The digit cards 0 to 9 are shared between them.

What numbers could be inside each one? Show your thinking notes and win a prize for the best thoughts and explanations!

23 thoughts on “Jolly Postman in a Pickle!”

1. Paige Proctor says:

4+3=7 3+4=7 2+5=7 5+2=7 6+1=7 1+6=7.
4+4=8 5+3=8 3+5=8 6+2=8 2+6=8 7+1=8.
9+4=13 8+5=13 7+6=13 6+7=13 5+8=13 4+9=13.
9+5=14 8+6=14 7+7=14 6+8=14 5+9=14.
1+2=3 2+1=3 4-1=3 5-2=3 6-3=3.

1. Wow Paige I think you’re the first to respond to the blog! Well done! Come and get a sticker from me tomorrow! Can I push your thinking a little further? Did you start with a strategy then change your mind or did you dive in straight away with different calculations for each envelope? Do you think now you could tell me exactly how the envelopes could be organised so no digit card is used more than once? 4+3=7 so that means 4 and 3 are in the envelope marked 7 – you can’t use them again! What then would be in the other envelopes? Mrs M

2. Paige Proctor says:

6+1=7 5+3=8 9+4=13 7+7=14 20-17=3

1. Is this the only answer Paige? I will be checking you can explain this to me! Mrs M

3. amie h says:

5+2=7 8-0=8 10+3=13 7+7=14 1+2=3
0+1=7 7+1=8 9+4=13 2×7=14 8-5=3
3=3=1=7 4+4=8 4+9=13 7×2=14 1×3=3
7+0=7 2×4=8 7+6=13 3+11=14
8-1=7 3+5=8 6+7=13 5+9=14
3+4=7 5+3=8 8+5=13 9+5=14

4. Harry B says:

3+4=7 4+4=8 10+3=13 10+4=14 1+2=3
4+3=7 7+1=8 3+10=13 4+10=14 2+1=3
1×7=7 4×2=8 1×13=13 7×2=14 1×3=3

1. Wow ths is interesting Harry. You’ve used addition and also x. Is there any way to do it only using addition I wonder? Have you tried? Have you decided what’s in each envelope? You can only use each digit once!

5. I think you can only use each number once. I tried different ways of aranging the cards until I found a solution. One envelope has only one card in. I will put my solution in the box.

1. Thanks Abbie.
I wonder if you have a strategy that you could explain to others to get a similar answer. Mr E

1. Abbie says:

I have now found lots of different ways. Can I set you a new challenge?
What if.. the envelopes have the numbers 10 5 15 9 6? Can you arrange the digit cards now?

2. I’ve seen your solution beautifully explained in the box Abbie! Great blogging! Persuade more people to join so I can release more problems! Mrs M

6. C.brooke says:

6+1=7 5+2=7 7+0=7 7-0=7

8+0=8 0+8=8 4+4=8
10+3=13 14-1=13 15-2=13 13+0=13

10+4=14 14+0=14
1+1+1=3 2+1=3 3+0=3

7. Katie says:

1+6=7 2+5=7 3+4=7

1+7=8 2+6=8 3+5=8 4+4=8

1+9+3=13 2+8+3=13 3+7+3=13 4+6+3=13 5+5+3=13

1+9+4=14 2+8+4=14 3+7+4=14 4+6+4=14 5+5+4=14

1+2=3 1+1+1=3

1. I can see some great thinking Katie but you need to narrow down exactly what would be in each envelope now! Happy sorting! Mrs M

8. Max says:

7+0=7 6+1=7 5+2=7 4+3=7 3+4=7 2+5=7 1+6=7

8+0=8 7+1=8 6+2=8 5+3=8 4×2=8 or 4+4=8 3+5=8 2+6=8 1+7=8

That’s all for 8+7

1. Max, I’m really interested in what you’ve done here. Can you offer any handy hints for others? Make sure you explain this and post it in the box!

9. Keeley & Rhia says:

7=3+4 8=8+0 3=2+1 13= 7+6 14=9+5

10. Harry B says:

8-0=8 7=3+4 3=2+1 13=7+6 14=9+5

1. Good work Harry. We looked at this in class last week and I can see it got you thinking. Why did you start with 8-0? Mr E

11. Izzi says:

1+6=7 3+4=7 2+5=7

1. Izzi says:

The numbers could be 7 or 14 because 7×2=14