Solve the maths puzzles

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1.
five times three
2.
fifteen plus five
3.
five plus eleven minus ten
4.
six times three
5.
seven times two
6.
ten plus three plus seven
7.
twelve minus seven plus two
8.
nine plus six minus four
9.
three times three minus one
10.
ten plus three plus six
11.
eight times two
12.
fifteen minus two
13.
four times four minus seven