Q&A - P4 Math
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mathnoobs:
Hi
thanks Tianzhu. The extra question will be useful for more drilling on this type of problems.
You're welcome.
Best wishes -
P4 math dont need calculator right? My ds kept pestering me to get one because he said the teacher said they needed one.
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jeestan:
P4 math dont need calculator right? My ds kept pestering me to get one because he said the teacher said they needed one.
Hi
Good Morning.
CALCULATORS IN PRIMARY 5 - 6 MATHEMATICS
http://www.moe.gov.sg/media/press/2007/pr20070427.htm
You may wish to check with the teacher why they needed one.
Best wishes -
P4 maths question:
Qn: The total mass of 9 one-dollar, fifty cent and twenty-cent coin is 52.47g.
How many of each type of coins are there?
( $1 = 6.3g, 50cents = 7.29g and 20cents = 4.5g )
Is there any faster way to get the answer other than using "guess and check" method? Guess and check is rather time-consuming. -
chokos:
HiP4 maths question:
Qn: The total mass of 9 one-dollar, fifty cent and twenty-cent coin is 52.47g.
How many of each type of coins are there?
( $1 = 6.3g, 50cents = 7.29g and 20cents = 4.5g )
Is there any faster way to get the answer other than using \"guess and check\" method? Guess and check is rather time-consuming.
Good Morning.
In this question, there are two conditions to be satisfied.
[list]- There are 9 one-dollar, fifty cent and twenty-cent coin.
[/list]A little planning in the beginning helps to reduce the number of guesses. I’ll share some pointers.
Their total mass is 52.47g.
A group of 1 one –dollar,1 fifty cent and 1 twenty-cent coin adds up to 18.09g (6.3+7.29+4.5)
Consider three groups of 1 one –dollar,1 fifty cent and 1 twenty-cent coin. They add up to 54.27g.
54.27 – 52.47 -------1.8
Difference between one-dollar and 20cents coin ------- 6.3 - 4.5 ------1.8
So swap the dollar coin with a 20 cents coin in the last group.
The answer is 2 one-dollar coin, 3 50 cents coin and 4 20 cent coin.
You may present the answer with “Systematic Listing”, “GC” or “Use a Diagram”
Best wishes - There are 9 one-dollar, fifty cent and twenty-cent coin.
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Dear Parents
Can anyone help with the following question?
A class has an equal number of boys and girls. Half of the boys and 15 girls do not wear glasses. 12 pupils in the class wear glasses. How many pupils are there in the class?
Thanks in advance. -
rocklee:
HiDear Parents
Can anyone help with the following question?
A class has an equal number of boys and girls. Half of the boys and 15 girls do not wear glasses. 12 pupils in the class wear glasses. How many pupils are there in the class?
Thanks in advance.
there are equal number of boys and girls. Total number of students = 4u, 1u = half the boys.
so, 3u = 12 + 15 = 27, 1u = 9
Total number of students in the class = 9 x 4 = 36
cheers. -
Use the number 1 to 9 to form a three digits number minus a three digit number and the answer is also a three digit number. Each number can only be used once. How many solution can u find? Is there any quick way to get the answer?
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Hi MathsIzzzfun
Thanks for your solution. -
rocklee:
u r welcomeHi MathsIzzzfun
Thanks for your solution.
cheers.
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