11. Round each factor to the nearest hundred and estimate the product of 689 X 520.
12.Write the number that is 600 more than the biggest number that can be formed by all the odd 1- digit numbers.
13. What number is 200 less than the product of 55 X 70?
14. If (N) X 4 /8-20= 48. What is N?
15. Write 76/1000 as a decimal.
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