Adding Bigger Numbers


1. A group of friends had a competition with their favourite computer game, Days of Doom, to see which of them would have the highest aggregate score over 3 games. In each case, estimate the aggregate score first, then add the numbers to see how accurate your estimate is. Use your calculator to check your answers.


Game Nathan Hannah Finola Dylan James Sarah 1 2 3


1795 2031


17200 5929


21604 3031


8912 9183


10043 2809


2. When Hannah went to bed, her mum and dad had a go at the game as well. See if you can do the same with their scores.


Game 123 Mum Dad


329 4653


6487 2098


Use your calculator to find the answers to the following problems. 3. Find the sum of 15436 and 29078.


4. While training for the school sports, Tom ran a distance of 12479 metres on Monday. On Tuesday he increased that distance by 2138 metres. How far did he run on Tuesday? How far did he run over the 2 days?


5. At a music festival, 21543 attended on the Friday, 27936 attended on Saturday and 23458 attended on Sunday. How many people attended the festival altogether?


6. Add the number of people in the class, the number of days in the year and the number of seconds in an hour.


We can use most of the same methods to estimate when we are subtracting. Use the first 3 ways of estimating to get different estimates for this problem:


Jane had €87.03 in her bank account. She withdrew €19.95. How much was left in the account?


Operations 1 23


91 34


19827 1006 4192 12495 22104 6008


15012 11508


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