Q&A - P5 Math
-
Thank u v much
-
Mrs Tan bought 25 soccer balls and basketballs for $1740. Each soccerball costs $84 and each basketball costs $48. How many of each type of balls did Mrs Tan buy?
I normally solve this using Algebra and simultaneous equations/substitution method. But my daughter is very resistant and refuses to use this method of solving such questions as she says the school haven’t taught Algebra and this method of solving.
Are there other ways of solving this tupe of questions using model/heuristics method that a pri 5 student would understand besides using Algebra?
If I hv no choice but to use Algebra, are there any good books/assessment books that somebody can recommend so I can use to teach her or introduce her to the idea of Algebra?
Thanks for your time. -
swordtail:
You can consider using either 'Chicken & Rabbit' method or 'Guess & Check' method. The first method is more straight-forward...Mrs Tan bought 25 soccer balls and basketballs for $1740. Each soccerball costs $84 and each basketball costs $48. How many of each type of balls did Mrs Tan buy?
I normally solve this using Algebra and simultaneous equations/substitution method. But my daughter is very resistant and refuses to use this method of solving such questions as she says the school haven't taught Algebra and this method of solving.
Are there other ways of solving this tupe of questions using model/heuristics method that a pri 5 student would understand besides using Algebra?
If I hv no choice but to use Algebra, are there any good books/assessment books that somebody can recommend so I can use to teach her or introduce her to the idea of Algebra?
Thanks for your time.
Assuming all the balls are basketball -> 25 x $48 = $1200
Difference in the total amount -> $1740 - $1200 = $540
Difference in price between soccerball and basketball -> $84 - $48 = $36
No of soccerball -> $540 / $36 = 15
No of basketball -> 25 - 15 = 10 -
hi, swordtail how about guess n check
-
A piggy bank contains 15 more 20cents coins than $1 coins.
The total value of $1 conis is $83.40 more than that of 20cents coins.
If the piggy bank contains only 20cents and $1 coins, what is the value of $1 coins in it? -
snowball:
HiA piggy bank contains 15 more 20cents coins than $1 coins.
The total value of $1 conis is $83.40 more than that of 20cents coins.
If the piggy bank contains only 20cents and $1 coins, what is the value of $1 coins in it?
Make the number of coins the same.
Add 15 number of $1 coin.
83.4 + 15 ------ 98.4
1 – 0.2 ----- 0.8
Number of 20cents coins ------- 98.4/0.8 ------ 123
Number of $1 coins ------ 108
Hence, its value ------$108
Alternatively, remove 15 number of 20cents coins which is $3.
83.4 + 3 ------ 86.4
1 – 0.2 ----- 0.8
Number of $1 coins ------- 86.4/0.8 ------- 108
Best wishes -
tianzhu:
Hisnowball:
A piggy bank contains 15 more 20cents coins than $1 coins.
The total value of $1 conis is $83.40 more than that of 20cents coins.
If the piggy bank contains only 20cents and $1 coins, what is the value of $1 coins in it?
Make the number of coins the same.
Add 15 number of $1 coin.
83.4 + 15 ------ 98.4
hi tianzhu, i still dont understand why 83.5+15 :? could u further explain ? TIA
1 – 0.2 ----- 0.8
Number of 20cents coins ------- 98.4/0.8 ------ 123
and why 98.4/0.8 ??? how & where can i learn more on this topic :lightrod: is this whole number topic?
Number of $1 coins ------ 108
Hence, its value ------$108
Alternatively, remove 15 number of 20cents coins which is $3.
83.4 + 3 ------ 86.4
1 – 0.2 ----- 0.8
Number of $1 coins ------- 86.4/0.8 ------- 108
Best wishes -
snowball:
Hi
why 98.4/0.8 ???
Please refer to your PM.
I've sent you a slide for a similar question done earlier.
Why 83.4+15?
Because, we are adding 15 number of $1 coins so as to make the number of 20 cents coins and $1 coins the same.
15 $1 coins = $15 and this is added to the existing $83.4
The difference between a $1 coin and a 20 cents coin is 20 cents or 0.20 cents.
We want to find number of 20 cents coins, so 98.4/0.8
Hope this helps.
Best wishes. -
MathIzzzFun:
Thx.redruby:
Tan was given a sum of money. He spent $460 on Monday and 1/3 of the remainder on Tuesday. On Wednesday, he spent another $300. Then Tan realized that he had 0.2 of the original sum of money left. Find the sum of money Tan was given?
Tan's money --> 10 units, 0.2 of Tan's money = 2 units
remainder after spending $460 --> 3 parts
2 parts = 2 units + $300
remainder --> 3 parts = 3 units + $450
Total = remainder + $460
10 units = 3 units +$450 + $460
7 units --> $910
10 units --> $1300
Tan was given $1300
cheers. -
Dan and Tan shared a number of balls in the ratio 4:5. After Dan and Tan purchased another 13 balls and 5 balls respectively, the ratio became 5:4. How many balls did Dan have at first?