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Maths problem...

Toon Wolf

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My girlfriends son (year 7) was given some maths homework and for the life of me I can't figure out one answer, even though I feel I should!

Using the numbers 4,5,6 and 7 once each he had to make every number from 1 to 10. He's got them all except 5. You can't go higher than 20 during the calculation so 4 × 6 isn't permitted for some reason.

For example, you can make 9 by 4 + 6 = 10 ÷ 5 = 2 + 7 = 9.

Anyone know how to make 5?
 

Penk Wolf

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I can't either. The closest I could get was 5.5.
 

The Bear

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He's not 7 years old.
 

Tredman

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6+4 = 10

7-5 = 2

10 /2 = 5
 

Penk Wolf

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I took your example too literally, as in the sum had to flow.
 

YoungWolf

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4+6=10

7-5=2

10 divided by 2 equals 5?
 

YoungWolf

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I've been looking at this for about half an hour without refreshing so you can call me clever too?
 

b3h

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(7-6) x (5-4)

(7-5) / (6-4)

For 1
 

b3h

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I'm intruiged as to if there is any other way of making 5
 

johnybig32

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There's a similar qn where using 1,2,4,8 you have to make all from 0-10.

All digits have to be used in each. You can combine digits to make numbers too.
 

darlowolf64

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There's a similar qn where using 1,2,4,8 you have to make all from 0-10.

All digits have to be used in each. You can combine digits to make numbers too.

Something like put the 1 & 8 together = 18; 2 x 4 = 8; 18 - 8 = 10? etc to get all the available numbers?

1 with 2, 12 - 8 = 4; - 4 = 0
8 - 4 = 4, 4 - 2 and 1 = 1
1 x 4 = 4, 8 - 4, - 2 = 2
8 + 1 = 9, - 4, - 2 = 3
8 x 2 = 16, x 1 = 16, divide by 4 = 4
8 + 2 = 10, 4 + 1 = 5, 10 - 5 = 5
8 + 2= 10, x 1 = 10, - 4 = 6
8 + 2 + 1 = 11, - 4 = 7
4 - 2 = 2, - 1 = 1, 8 x 1 = 8
8 + 4 = 12, - 2 then - 1 = 9
 
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