We use numbers when..... we use our mobile phone. 2. We can send alert message or ............. email. 3. We also use the numbers ............ our mobile phone. 4. We can use the numbers when we need ..... to...... calculate. 5. The twenty-third .......f...... March 1. People started to cont. thousands of year ago. 2. Nineteen..Plus......... Nine is twenty-eight. 3. The Arabs invented new symbols for the number... one to nine. 4. Twenty-four minus...... fourteen is ten. 5. Indians invented a symbo... For zero along time ago. 6. Sudanese people used numbers when they build.... 1 The pyramids. (D)