You can use place value headings, like ones, tens and hundreds, to help you understand the value of each digit. When only one digit is used, such as 4, it represents 4 ones. When two digits are ...

This means breaking a number up into tens and ones, or hundreds and tens to help with the addition. Let's look at another question. Start from the ones column: 3 + 9 = 12. This needs regrouping ...