[P6] Problem Sum No. 8: Muffins in Boxes

Ali sold muffins in boxes of threes and fours. At first he had 5 times as many small boxes as big boxes. After selling 2/5 of the small boxes and some big boxes, he packed another 12 more big boxes. As a result the number of unsold small boxes became twice the number of unsold big boxes. If the total of unsold muffins was 150 how many big boxes did he sell? Asked by wife’s colleague, Lilian Date: 18...

[P6] Problem Sum No. 7: Simon’s and Peter’s Cards...

Simon and Peter had a total of 900 cards. Simon gave 1/5 of his cards to Peter. Peter then gave 1/4 of his cards to Simon. In the end, each of them had the same number of cards. How many cards did Simon have at first? Asked by Dave Tan KX (of North Vista Primary School) Date: 25 Feb 2016 Source: Nan Hua Primary, P6, CA1 2014 In case you haven’t seen it, our No Problem Sums Facebook page...

[Intl] Problem Sum No. 6: Glenda’s Money

Glenda had a sum of money. She gave 2/7 of her money and another $105 to her parents. Then she gave 4/9 of the remaining money to her brother. She had 1/3 of her original amount of money left. How much did she have at first? Asked by Mark (Email: mmar?????@yahoo.com) Date: 24 Sep 2015 Source: Posted via No Problem Sums contact form I was pleasantly surprised to receive a problem sum submitted via our contact form. Our website...

[P6] Problem Sum No. 5: Sum of Digits

A certain two-digit number is 3 times the sum of its digits. What is this number? Asked by Mark Heng Date: 26 May 2013 Source: www.algebra.com; adapted, P6 This type of problem sum certainly looks tricky — doesn’t seem like there are many clues. And it is tempting to think of one general method to solve it: Algebra! Parents, was algebra the first thing that came to your mind? Do you think there could be simpler ways to tackle...

[Intl] Problem Sum No. 4: Prime Factorization

What prime numbers have the product of 111111? Asked by Rebecca C Date: 21 March 2013 Source: International School; Gifted Math Program, Grade 5 Variety is the spice of life. Without different things to do, we may just die of boredom. So it is the same with Mathematics — explore and learn about different Maths topics to keep interest in the subject alive. That’s my personal but serious opinion; tell me if you agree or disagree in the “Leave...

[P2] Problem Sum No. 3: Mr and Mrs Chan’s Weights

Mr Chan has a mass of 75kg. Mrs Chan weighs 16kg less than Mr Chan. (a) What is the mass of Mrs Chan? (b) What is the total mass of Mr and Mrs Chan? Asked by Mark Heng; taken from his son’s school work Date: 17 May 2013 Source: St. Gabriel’s Primary, P2 Maths questions involving people’s weight, height and age are quite common. Typically, one person will be used as a measurement reference point while each of the...

[P2] Problem Sum No. 2: Children and Sweets

Mrs Lim gave 18 sweets to some children. If each child received 2 sweets, how many children were there? Asked by Mark Heng; taken from his son’s school work Date: 17 May 2013 Source: St. Gabriel’s Primary, P2 Sweets work wonders on children. Just look at the glow on a child’s face when he or she is given some candy. For all the parents reading this, I’m sure it brings back sweet childhood memories as well 😉 Without question,...

[P2] Problem Sum No. 1: People in the Cinema

There are 400 people in a cinema. 100 of them are adults and the rest are children. How many more children than adults are there in the cinema? Asked by Mark Heng; taken from his son’s school work Date: 7 May 2013 Source: St. Gabriel’s Primary, P2 Alright! My No Problem Sums website is now live and I’m rolling out worked examples at a casual pace. It’s gonna take some effort and time to build up a library of...