Playing+with+Numbers

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 * Have a go at the following problems. Add your comments below to help one another solve these problems. I have given you a few clues to help you as we start out on this journey ... I hope you have fun. Click on the little 3 in the speech bubble on the right to get some hints if you need them! **======

** Mrs G :D **
__**Problem 1: **__ =Choose any number between 32 and 56. Add 20. Subtract 17. Add 13. Subtract your original number. What is the resulting number? =

**Remember to add your comments in here for everyone else to see / share ...** Eg, you could come on and try a number ... I tried 34 + 20 -17 + 13 - 34 = 16 or I noticed that you get rid of (minus) the number you started with, so that number makes no difference, so it's really 20 -17 + 13 = 16 What do you think? Do you agree with me? Mrs G

i agree with you 100% on that one josh a

I also agree but my way was 33+20-17+13-33 =16. This problem is a trick my uncle taught me, if you ask some year 5s they might remember the trick. ~Justin~

 I understand now. I chose 42+20-17+13-42=16 !jasmine

I did 43. It ended up 16 and I know why All you have to do is switch the numbers around. I realised 43 - 43 equals 0 then you just do the rest.﻿ ﻿ Emanuel :D:) oh and I did not read the comments, Just letting you know.E-man waz here


 * I didn't know which number to pick so I did 20+13=33. 33-17=16 which was what the answer is. but I realised that I did the same thing as Mrs G ten minutes later! Anne Pham **

what i did was 50+20= 70, 70-17= 53 53+17=70 ,70 ,70-50 =20.
 * ** Alan

 __**Problem 2: **__ =**What is the sum?** = =**81 + 18 + 72 + 27 + 63 + 36 + 54 + 45 + 4 **=

The answer is 400. The trick is with the number 9. Most groups add up to 9. ~Justin~

I got 400 to. But can you explain what does the 9 do? !jasmine!

I got 400 the trick is that the backward number pairs(81+18, 72+27 etc.) add to 99 so you just times 99 by 4 and add 4 CHRIS :D


 * I got 400. I did a long algorithm. Anne Pham **.

done the same thing as justin 400 jack

Yes I believe Chris (I did exactly what Chris did) E-man waz here

__**Problem 3: **__ =**<span style="color: #4800ff; font-family: Georgia,serif;">What number makes the statement true? ** = =<span style="color: #4800ff; font-family: Georgia,serif;">220 - 22 equals __ x 22 = i got the answer 9. did anyone else get the same? !jasmine!

Me to <span style="color: #ff0000; font-family: Arial,Helvetica,sans-serif; font-size: 130%;">By the way Mrs. G what is with the 2 lines <span style="font-family: Arial,Helvetica,sans-serif;">﻿ CHRIS :D <span style="color: #7700ff; font-family: Arial,Helvetica,sans-serif;">Had a problem because the site would not co-operate!! He-he!! :( Happens to all of us sometimes!!

I got 9 as well because 220-22= 198 and then 9x22=198 ~JUSTIN~ :D

BUT DID ANY OF YOU NOTICE THAT 220 IS 10 LOTS OF 22?? THAT MEANS THAT 10 LOTS OF 22 (220) - 22 = 9 LOTS OF 22!!! (WITHOUT ACTUALLY DOING ANY CALCULATING!!)

I like this wikispace ... do you like it? Do you want me to create some more pages with different types of problems, as well as adding more problems here for you to share??? Please let me know. :) Mrs G

**If underscorced doesn't mean minus than what does it mean?**

**If it means nothing I will just ignore it.** **I would do 220-22=198. 198 divided by 22=9. So the answer is nine.** **They all all easy!**

No Anne Mrs G had trouble with the website Emanuel (E-man) :)

what i did was 50+20= 70 70-17= 53 53+17=

<span style="color: #000000; font-family: arial,helvetica,sans-serif;">__**<span style="background-color: #ffffff; color: #4800ff; font-family: Georgia,serif;">Problem 4: **__

= **<span style="color: #4800ff; font-family: Georgia,serif;">A starting number is multiplied by 4. Then 14 is added to the result. The new number is 6 times the starting number. What is the starting number? ** = = =

<span style="color: #000000; font-family: arial,helvetica,sans-serif;"> <span style="color: #000000; font-family: arial,helvetica,sans-serif;">__**<span style="background-color: #ffffff; color: #4800ff; font-family: Georgia,serif;">Problem 5: **__

= **<span style="color: #4800ff; font-family: Georgia,serif;">Madison buys some five-cent stamps and some ten-cent stamps for a total of $1. She receives 13 stamps. How many 5c stamps does she buy? ** =

<span style="color: #000000; font-family: arial,helvetica,sans-serif;"> <span style="color: #000000; font-family: arial,helvetica,sans-serif;"> <span style="color: #000000; font-family: arial,helvetica,sans-serif;"> <span style="color: #000000; font-family: arial,helvetica,sans-serif;"> <span style="color: #000000; font-family: arial,helvetica,sans-serif;"> <span style="color: #000000; font-family: arial,helvetica,sans-serif;">

<span style="font-family: Georgia,serif;"> <span style="color: #000000; font-family: arial,helvetica,sans-serif;"> <span style="color: #000000; font-family: arial,helvetica,sans-serif;">__**<span style="background-color: #ffffff; color: #4800ff; font-family: Georgia,serif;">Problem 6: **__

= **<span style="color: #4800ff; font-family: Georgia,serif;">Two years ago my age was a multiple of 6. Last year it was a multiple of 5. I am less than 50 years old. How old am I now? ** =

<span style="color: #000000; font-family: arial,helvetica,sans-serif;">__**<span style="background-color: #ffffff; color: #4800ff; font-family: Georgia,serif;">Problem 7: **__

= **<span style="color: #4800ff; font-family: Georgia,serif;">5A4 and 6B9 are three-digit numbers. 6B9 is the sum of 5A4 and 125. 6B9 is divisible by 9. Find the value of A. ** =

<span style="color: #000000; font-family: arial,helvetica,sans-serif;">__**<span style="background-color: #ffffff; color: #4800ff; font-family: Georgia,serif;">Problem 8: **__

= **<span style="color: #4800ff; font-family: Georgia,serif;">In a group of 25 girls, 8 run for the track team, 13 are on the Maths team and 6 are on both teams. How many of the girls are not in either team? ** =

<span style="color: #000000; font-family: arial,helvetica,sans-serif;">__**<span style="background-color: #ffffff; color: #4800ff; font-family: Georgia,serif;">Problem 9: **__

= **<span style="color: #4800ff; font-family: Georgia,serif;">I climb half the steps in a staircase. Next I climb one-third of the remaining steps. Then I climb one-eighth of the rest and stop to catch my breath. What is the smallest possible number of steps in the staircase? ** =

<span style="color: #000000; font-family: arial,helvetica,sans-serif;">__**<span style="background-color: #ffffff; color: #4800ff; font-family: Georgia,serif;">Problem 10: **__

= **<span style="color: #4800ff; font-family: Georgia,serif;">A bus can hold 24 adults or 30 children. 25 children are already on the bus. What is the largest number of adults that can still get on the bus? ** =