Every digit in a number has a value, depending on its
position in the number. This is called its

Round ? when the key digit is 5, 6, 7, 8 or 9.

Round ? when the key digit is 1, 2, 3 or 4.

When you multiply a number by 10, all the digits in the
number move ? place to the left.

When you multiply a number by 100, all the digits in the
number move ? places to the left.

When you multiply a number by 1000, all the digits in
the number move ? places to the left.

When you divide a number by 10, all the digits in the
number move place ? to the right.

When you divide a whole number by 100, all the digits in
the number move ? places to the right.

Add and ? are opposite calculations.

Multiply and ? are opposite calculations.

A negative or minus sign written in front of a number, for
example, –5, shows that it is ? .