Chocolate Mathematics : Chocolate Mathematics
Chocolate Mathematics is fun…and delicious! : Chocolate Mathematics is fun…and delicious!
Use your OGT calculator for this activity and practice! : Use your OGT calculator for this activity and practice!
Did you know that I can figure out how much you like chocolate?Let’s give it a try! : Did you know that I can figure out how much you like chocolate?Let’s give it a try!
Remember to push the red AC button for “All Clear” on your calculator! You should do this before every problem! : Remember to push the red AC button for “All Clear” on your calculator! You should do this before every problem!
First, pick a number of times a week that you would like to have chocolate. Enter that number on your calculator. : First, pick a number of times a week that you would like to have chocolate. Enter that number on your calculator. You have to choose a number more than 1 BUT less than 10.
Now, let’s pretend that you could eat lots and lots of chocolate and never have to worry about cavities or nutrition! Take the number you chose and multiply it by 3. : Now, let’s pretend that you could eat lots and lots of chocolate and never have to worry about cavities or nutrition! Take the number you chose and multiply it by 3. x 3 =
Now, add your original number AND 1 to it: : Now, add your original number AND 1 to it: + __ + 1 =
This is the number you chose at the start, when you had to decide how many times you wanted chocolate in a week!
Add 11 to it. : Add 11 to it. + 11 =
Divide it by 4. : Divide it by 4. ∙∙ 4 =
Now subtract 3 from your answer. : Now subtract 3 from your answer. - 3 =
Your answer should be the number of times you wanted chocolate this week! : Your answer should be the number of times you wanted chocolate this week! How did I do??? Did it come out right?
Slide 13: End of part one
Now let’s give you more practice on the calculator – using more of the keys.Here we go… : Now let’s give you more practice on the calculator – using more of the keys.Here we go…
Let’s pretend we had to find the area of this triangle. Remember, the formula for area of a triangle is ½ base x height.Plug in the numbers: ½ (12)(9)Use your calculator. What do you get? : Let’s pretend we had to find the area of this triangle. Remember, the formula for area of a triangle is ½ base x height.Plug in the numbers: ½ (12)(9)Use your calculator. What do you get? 9 in. 12 in.
There are a couple of different ways you could do this on the calculator…A) If you realize that ½ is the same as .5, you might push .5 x 9 x 12 = and you would get 54 in2B) You could also use the fraction key, that looks like this: Using this fraction key, you would push: 1 2 (for ½) x 9 x 12 = and you would get 54 in2 : There are a couple of different ways you could do this on the calculator…A) If you realize that ½ is the same as .5, you might push .5 x 9 x 12 = and you would get 54 in2B) You could also use the fraction key, that looks like this: Using this fraction key, you would push: 1 2 (for ½) x 9 x 12 = and you would get 54 in2
Let’s try another one. Say you had to solve this equation:173 + 94(16) + 74 = Go ahead and try it on your calculator.Don’t forget: the exponent key looks like this: : Let’s try another one. Say you had to solve this equation:173 + 94(16) + 74 = Go ahead and try it on your calculator.Don’t forget: the exponent key looks like this:
173 + 94(16) + 74 = Check your work! Here is one way to solve this equation using the OGT calculator:A) Push: 17 3 + 94 x 16 + 74 =And you should get 6491 : 173 + 94(16) + 74 = Check your work! Here is one way to solve this equation using the OGT calculator:A) Push: 17 3 + 94 x 16 + 74 =And you should get 6491
Here’s your next problem to solve:-52 x √121 = ___Use your calculator to find the answer. Check your work on the next page.Don’t forget: To get a square root, you must press the green INV key, then the x2 key.To change the sign of a number, use the ‘change sign’ key that looks like this: : Here’s your next problem to solve:-52 x √121 = ___Use your calculator to find the answer. Check your work on the next page.Don’t forget: To get a square root, you must press the green INV key, then the x2 key.To change the sign of a number, use the ‘change sign’ key that looks like this:
How did you do? Here’s the equation again:-52 x √121 = ___You should have pushed: : How did you do? Here’s the equation again:-52 x √121 = ___You should have pushed: 52 x 121 =
-572
You’re doing great! Here’s the last one. Useyour calculator to find the answer. Check your work on the next page.Problem: Find the area of this circle: Remember: The formula for area of a circle is r2. On your calculator, you get (pi) by pushing the green INV key, then the Exp key. : You’re doing great! Here’s the last one. Useyour calculator to find the answer. Check your work on the next page.Problem: Find the area of this circle: Remember: The formula for area of a circle is r2. On your calculator, you get (pi) by pushing the green INV key, then the Exp key. r = 3cm
Slide 22: r = 3cm Here’s how you can use the calculator to solve A = r2 Push x 3 =
28.3 cm2
OK, good job! I think you’ve earned yourself some chocolate! : OK, good job! I think you’ve earned yourself some chocolate!