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Tuesday, September 26 2017 @ 04:38 PM CDT
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 Math problem need help
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By: amast (offline)  Saturday, October 10 2009 @ 02:20 AM CDT (Read 1710 times)  
amast

hi
I had a few maths problem sum dun know how to solve.Pls help show me the step.I need to explain to my kids


thanks

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By: AStar09 (offline)  Sunday, October 11 2009 @ 11:14 PM CDT  
AStar09

Quote by: amast

hi
I had a few maths problem sum dun know how to solve.Pls help show me the step.I need to explain to my kids


thanks



Hi amast,

Here are my steps:
Grandchildren = GC

a)
(6 stamps X Grandchildren) + 5 stamps = (8 stamps X Grandchildren) - 9 stamps
6GC + 5 = 8GC - 9
9 + 5 = 8GC - 6GC
14 = 2 GC
!4 / 2 = GC
7 = GC
Grandpa have 7 grandchildren.

b)
[(6 stamps X 7 grandchildren) + 5 stamps] = 47
or
[(8 stamps X 7 Grandchildren) - 9 stamps] = 47
Grandpa have 47 stamps altogether.

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By: amast (offline)  Friday, October 16 2009 @ 09:18 PM CDT  
amast

Hi
thanks for your step.By the way anyone this method is it teach in the primary three ?
I afraid my kids dun understand when I use this method to expain to him.
Anyway many thanks to U.

Regards

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By: mrsccyl (offline)  Monday, October 19 2009 @ 12:25 AM CDT  
mrsccyl

Hi,

If your child is a pictorial learner, you may want to try this.

Groups of 6 with 5 left overs
what will it look like with counters placed in columns

Groups of 8 with 9 short
what will it look like if we keep the group of six in columns;
how many columns of six do we need? answer 7

1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 0
0 0 0 0 0 0 0 0 --- --- set of 8 if counting rows; short of 9

set of 6 if counting columns with 5 leftovers

Hence, grandpa has 7 grandchildren.
Number of stamps is computed as follows
7x7=42
42+5=47

Alternatively, do a table listing

grandchild 1 2 3 4 5 6 7 ...
x6, +5 --- 11 17 23 29 35 41 47 ...
x8, -9 --- -1 7 15 23 31 39 47 ...

Answer is obvious, 7 grandchildren, 47 stamps.
Trick is to know when to stop the listing; when number is about 6x8=48

Hope this is helpful

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