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## Topic 3: Place value (Integers)  An integer is a whole number.

When an integer is multiplied by 10, each digit is multiplied by 10.

Example: 23 × 10 = 230

All of the digits have moved by one column to the left, and the units column is now empty.

When an integer is multiplied by 100, each digit is multiplied by 100.

Example: 15 × 100 = 1 500

All of the digits have moved by two columns to the left, and the units and tens columns are now empty.

When an integer is multiplied by 1 000, each digit is multiplied by 1 000.

Example: 6 × 1 000 = 6 000

All of the digits have moved by three columns to the left, and the hundreds, units and tens columns are now empty.

When an integer is divided by 10, each digit is divided by 10.

Example: 380 ÷ 10 = 38

All of the digits have moved by one column to the right.

When an integer is divided by 100, each digit is divided by 100.

Example: 4 900 ÷ 100 = 49

All of the digits have moved by two columns to the right.

When an integer is divided by 1 000, each digit is divided by 1 000.

Example: 5 000 ÷ 1 000 = 5

All of the digits have moved by three columns to the right.      bottom of page