Parallelogram 39 • Level 1 • 30 May 2024Multifactorials
Noun: Parallelogram Pronunciation: /ˌparəˈlɛləɡram/
- a portmanteau word combining parallel and telegram. A message sent each week by the Parallel Project to bright young mathematicians.
- Tackle each Parallelogram in one go. Don’t get distracted.
- Finish by midnight on Sunday if your whole class is doing parallelograms.
- Your score & answer sheet will appear immediately after you hit SUBMIT.
- Don’t worry if you score less than 50%, because it means you will learn something new when you check the solutions.
1. Multifactorials
You may have heard of factorials, but we bet you’ve never heard of a multifactorial!!
(If you have problems watching the video, right click to open it in a new window)1 mark
1.1 How would you calculate 6!
- 6 × 5 × 4 × 3 × 2 × 1
- 6 + 5 + 4 + 3 + 2 + 1
- 6 × 3 × 1
- 6 × 6 × 6 × 6 × 6 × 6
- (Not answered)
1 mark
1.2 How would you find 6!! ?
- 6! × 6!
- 6 × 5 × 3 × 1
- 6 × 4 × 2
- 6 × 5 × 4
- (Not answered)
2 marks
1.3 Given that 6! = 720, what is 7! ?
Correct Solution: 5040
Show Hint (–1 mark)
–1 mark
7! = 7 × 6!
2. A coin challenge
2 marks
2.1 Max has a 1p coin, a 2p coin and a 5p coin.
Which sum of money can he not make?
- 4p
- 5p
- 6p
- 7p
- 8p
- (Not answered)
3. Dozen it make sense?
2 marks
3.1 What is twelve thousand plus twelve hundred plus twelve?
- 12,121
- 13,212
- 121,212
- 132,012
- 1,212,012
- (Not answered)
Before you hit the SUBMIT button, here are some quick reminders:
- You will receive your score immediately, and collect your reward points.
- You might earn a new badge... if not, then maybe next week.
- Make sure you go through the solution sheet – it is massively important.
- A score of less than 50% is ok – it means you can learn lots from your mistakes.
- The next Parallelogram is next week, at 3pm on Thursday.
- Finally, if you missed any earlier Parallelograms, make sure you go back and complete them. You can still earn reward points and badges by completing missed Parallelograms.
Cheerio, Simon.