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Don't cheat and write it down or use a calculator
until you try it in your head!
Take 1000 and add :
40
1000
30
1000
20
1000
and 10
What is the total ? 4100

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  • 1. Don't cheat and write it down or use a calculator until you try it in your head! Take 1000 and add : 40 1000 30 1000 20 1000 and 10 What is the total ? 4100