A plus times a plus is still a plus. Below is the way I remembered it:
If there is not a minus sign, it is plus (positive).
If there is 1 minus sign, it is minus (negative).
If there are 2 minus signs, it is plus (positive).
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+ times a + = a plus- times a + = a minus- times a - = a plus+ times a - = a minus
two times one hundred plus three times ten plus one times one plus four times one tenth plus five times one hundredth. ANSWER: 231.45 ANSWER IN WORDS: two hundred thirty one and forty-five hundredths
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8060 Source: calculator
plus times plus = plus minus times plus = minus plus times minus = minus minus times minus = plus so when you subtract a number it is the same as adding its negative; for example 7 - 4 = 3 7 + (1)(-4) = 3