Simplify the following:
$7.5 + 0.75 + 7.705$

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Solution

Step 1: Changing given decimals into like decimals.
$7 . 5 0 0 0 . 7 5 0 + 7 . 7 0 5$
Step 2: Arranging them according to place value.
$O t h th 7 . 5 0 0 0 . 7 5 0 + 7 . 7 0 5$
Sum is,
$O t h th carry - over 1 7 . 5 0 0 0 . 7 5 0 + 7 . 7 0 5 15 . 9 5 5$

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15 \times 35 + 5 45

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0.55 \times 0.55 - 0.55 \times 1.5 + 0.75 \times 0.75

7 + 77 + 777 + 7 9 + 77 99 + 777 \times 999

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Simplify: $7.5 - 3.2 + 4.6$

0.55 \times 0.55 - 0.55 \times 1.5 + 0.75 \times 0.75

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