## Tuesday, December 30, 2014

### P5 numbers, conditional (fr Ranice)

A tin of cookies is to be shared among some children.If each child gets 12 cookies,there will be a shortage of 25 cookies.If each child gets 10 cookies,there will be 7 cookies extra.How many cookies are there in the tin?

## Monday, December 15, 2014

### P5 Whole Numbers (fr: Ranice)3

Q3.
Mr Hua bought 40 packs of Christmas cards at the price of \$12 per pack.He sent 30 of these cards to his friends and sold the rest at \$3 each.If he made a profit of \$270,find the number of Christmas cards in each pack.

### P5 Whole Numbers (fr: Ranice)2

Q2.
Jason bought 16 boxes of erasers at the price of \$5 per box.He donated 120 erasers to an orphanage and sold the rest of the erasers at 70 cents each.If he made a profit of \$60,find
(a)the number of erasers in each box
(b)the cost price of each eraser.

### P5 Whole Numbers (fr: Ranice)

Q1.
May bought 25 packets of hairpins at the price of \$8 per packet.She kept 50 hairpins for her own use and sold the rest of the hairpins at 20 cents each.If she made a profit of \$40,find the number of hairpins in each packet.

## Sunday, December 7, 2014

### Algebra (Fr CCL)

AB is a two-digit number. BA is the two-digit number with the 2 digits of AB interchanging position.

(i) Observe what happens when you perform AB - BA. Try different combinations of AB and BA.
(ii) Explain/proof (using Algebra or otherwise) why the results in (i) always turn out to be multiples of 9?

## Sunday, November 16, 2014

My solution:

### Algebra, quiz (fr CKM)

My solution:
http://flic.kr/p/pN2aGU

## Tuesday, September 23, 2014

### P6 Numbers, measurement (fr Kevin)

An ant is climbing up a slippery wall.  After every 3 cm it climb up , it slide down 1 cm. It takes the ant 3 seconds for it to climb up 1 cm and 1 second for it to slide 1 cm

A) how far can it climb in a minute

B) how long does it take to climb 60 cm

Sent from my iPhone

Find BDC.

## Saturday, September 20, 2014

### P6 fraction n percentage (Fr Zachary)

3/5 of the people at the party were adults. 75% of the remainder were boys. There were 150 more adults than girls. After more children came to the party, there was 60% more children. How many more children joined the party?