**Add and subtract numbers with up to three digits, using formal written methods of columnar addition and subtraction**

Year 3 Addition Formal addition Fluency – Fluency questions

Year 3 Addition Formal addition Problem Solving – Problem solving questions

Year 3 Addition Formal addition investigation – A printable version of the problem below

**Investigation:
Addition investigation**

Prove it: is it always, sometimes or never true?

When you add two even numbers together, you have an even answer.

When you add two odd numbers together, you get an even answer.

When you add three odd numbers together, you end with an even answer.

Answers:

Adding any even numbers together always gives an even answer.

When you add two odd numbers together it gives an even answer.

Adding of three odd numbers gives an odd answer.