200
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100 add 4.99 add 200 add 100 add 16 and add 3 is 423.99
144
200
It's easy to work it out yourself.... Multiply 100 by 49, add 50, add 100 - and you have your answer !
Add a 0 onto 100, or add 2 0's onto 10. Multiply by 10 = add a 0 Multiply by 100= add 00 Multiply by 1000 = add 00 Teachers prefere not to say 'add a 0'. This is like a cheat, and does not work for decimals.