Mathematics Competition for Elementary School
1. Karl had salary reduced by 10%. He was later promoted and his salary was increased by 10%. If his original salary was $20.0000, what is his present salary ?
A. $ 16.200
B. $ 19.800
C. $ 20.000
D. $ 20.500
2. The prime numbers between 10 and 20 are added together to form the number Q. What is the larges prime divisor of Q ?
A. 2
B. 3
C. 5
D. 7
Answer ?
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Writing Variables Expressions
In everyday conversation, people use word phrases that express mathematical ideas. As you read the following conversation, notice the use of mathematical expressions.
“Hi Frank. How was the car was ?” Fabulous, Gina ! We made twice as much maoney as we did last year. We washed 80 more cars than last year!” Great ! That means we’ll be able to lower the cost of the band trip by $2 per person.”
1. Identify the mathematical phrases in Frank and Gina’s conversation.
Even though you know how much money the band made last year, you can express the amount the made this year by writing expression a variable expression.
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