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Without adding ,find the sum : 1+3+5+7+9...

Without adding ,find the sum :
1+3+5+7+9+11+13+15+17+19.

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MBD-SQUARES AND SQUARE ROOTS.-EXERCISE
  1. Without adding ,find the sum : 1+3+5+7+9+11+13+15+17+19.

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  2. What will be the unit digit of the squares of the following numbers: 4...

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  3. What will be the unit digit of the squares of the following numbers: 5...

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  4. What will be the unit digit of the squares of the following numbers: 7...

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  5. What will be the unit digit of the squares of the following numbers: 2...

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  6. What will be the unit digit of the squares of the following numbers: 1...

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  7. What will be the unit digit of the squares of the following numbers: 3...

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  8. What will be the unit digit of the squares of the following numbers: 2...

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  9. What will be the unit digit of the squares of the following numbers: 5...

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  10. What will be the unit digit of the squares of the following numbers: 1...

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  11. What will be the unit digit of the squares of the following numbers: 3...

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  12. The following numbers are obviously not perfect squares.Give reason. 5...

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  13. The following numbers are obviously not perfect squares.Give reason. 6...

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  14. The following numbers are obviously not perfect squares.Give reason. 3...

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  15. The following numbers are obviously not perfect squares.Give reason. 2...

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  16. The following numbers are obviously not perfect squares.Give reason. 8...

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  17. The following numbers are obviously not perfect squares.Give reason. 9...

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  18. The following numbers are obviously not perfect squares.Give reason. 3...

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  19. The squares of which of the following would be odd numbers? 333

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  20. The squares of which of the following would be odd numbers? 2665

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  21. The squares of which of the following would be odd numbers? 24877

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