A Calculator – Free Math Challenge: Put Your Skills to the Test!
Hey there, math whizzes and number enthusiasts! We’ve got an exciting and brain – teasing task for you. This isn’t your typical math drill where you can rely on the convenience of a calculator. Nope, we’re going old – school and challenging you to solve this math test strictly by using your mental math skills, pencil – and – paper calculations, and your in – depth understanding of mathematical concepts.
So, roll up your sleeves, grab a pencil and some paper if you need them, and get ready to take on this calculator – free math test. The questions await, and the satisfaction of solving them on your own is just a calculation away!
Ready to see the answer?
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Answer:
- First, observe the addition operations in the expression:
- In the expression 25+25+25+25−25+55+15+25, there are multiple 25s being added.
- First, calculate the sum of the 25s. The sum of 4 25s can be written as 25×4=100 (Four times 25 equals 100.).
- Now the expression becomes 100−25+55+15+25.
- Then, calculate in order from left to right:
- First, calculate 100−25=75 (One hundred minus twenty-five equals seventy-five.), and the expression becomes 75+55+15+25.
- Next, calculate 75+55=130 (Seventy-five plus fifty-five equals one hundred and thirty.), and the expression becomes 130+15+25.
- Then, calculate 130+15=145 (One hundred and thirty plus fifteen equals one hundred and forty-five.), and the expression becomes 145+25.
- Finally, calculate 145+25=170 (One hundred and forty-five plus twenty-five equals one hundred and seventy.).
So, 25+25+25+25−25+55+15+25=170.
