b) \( -90 \times 15 \div 5-45+32 \) d) \( 55+48 \div 6-11 \times 7 \) f) \( 12 \times 150 \div 15-(4+52) \) h) \( 70-50 \times 95 \div(14+5)+21 \)
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Extra Insights
For the first expression, you’ll find that operations follow the order of multiplication and division before addition and subtraction. Starting with \( -90 \times 15 \), you get \( -1350 \). Then divide by \( 5 \) to get \( -270 \). Continue with \( -270 - 45 + 32 \) to ultimately arrive at \( -283 \). In the second expression, begin with \( 48 \div 6 \) which yields \( 8 \). After that, \( 55 + 8 - 11 \times 7 \) starts as \( 55 + 8 - 77 \), leading to \( -14 \) as the final answer. Watching out for the sequence of operations can save you from making small but costly mistakes!