Can you complete our maths challenges?

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__Find the Difference__

*Years 1 and 2*

Place the numbers 1 to 6 in the circles so that each number is the difference between the two numbers just below it.

Example:

5 - 2 = 3

When you have tried this and got more than one answer you could try other things like having 4 rows of discs and use the number 1 to 10

__Four Digit Targets__

*Years 3 and 4*

You have two sets of the digits from 0 to 9.

The idea is to arrange these digits in the five boxes to make four-digit numbers as close to the target number as possible.

You may use each digit once only.

__Sealed Solution__

*Years 5 and 6*

A set of ten cards, each showing one of the digits from 0 to 9, is divided up between five envelopes so that there are two cards in each envelope.

The sum of the two numbers inside it is written on each envelope:

What numbers could be inside the "8" envelope?