DAY 114:

Today’s Challenge

Can you replace the 12 gaps below with the 12 numbers 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12 and 13 so that all four lines work out arithmetically?

◯   +   ◯   =   ◯
◯   +   ◯   =   ◯
◯   +   ◯   =   ◯
◯   +   ◯   =   ◯

Click on this MATHELONA link for details of similar challenges.

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The 7puzzle Challenge

The playing board of the 7puzzle game is a 7-by-7 grid containing 49 different numbers, ranging from up to 84.

The 3rd & 4th rows of the playing board contain the following fourteen numbers:

3     10     13     25     32     35     36     42     44     45     54     60     66     80

List THREE different numbers that have a sum of 100.

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Answers

. . . can be found when clicking this.

7puzzleblog

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DAY 113:

Today’s Challenge

Here is a unique 7-part question.  Firstly, answer all seven parts:

  1. (4 + 3) + (2 – 1) = ?
  2. (4 × 3) ÷ (1 × 1) = ?
  3. (4 – 3) × (2 ÷ 1) = ?
  4. (3 + 3) ÷ (2 × 1) = ?
  5. (3 ÷ 3) – (1 + 1) = ?
  6. (3 – 3) × (1 ÷ 1) = ?
  7. (3 × 3) – (2 + 1) = ?

then find the sum of all seven answers.  What is your overall answer?

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The 7puzzle Challenge

The playing board of the 7puzzle game is a 7-by-7 grid containing 49 different numbers, ranging from up to 84.

The 3rd & 4th rows of the playing board contain the following fourteen numbers:

3     10     13     25     32     35     36     42     44     45     54     60     66     80

What is the difference between the two multiples of 8?

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Answers

. . . can be found when clicking this.

7puzzleblog

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DAY 112:

Today’s Challenge

If you multiply a mystery number by 6 and then subtract 6, the result is the same as if you first multiplied the same mystery number by 3 and then added 3.

Is the value of this mystery number 1, 2, 3, 4 or 5?

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The 7puzzle Challenge

The playing board of the 7puzzle game is a 7-by-7 grid containing 49 different numbers, ranging from up to 84.

The 3rd & 4th rows of the playing board contain the following fourteen numbers:

3     10     13     25     32     35     36     42     44     45     54     60     66     80

From the list, what is the sum of the multiples of 7?

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Answers

. . . can be found when clicking this.

7puzzleblog

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DAY 111:

Today’s Challenge

. . . is an exciting Japanese puzzle where you have to insert 1, 4, 5 and 5 into the four gaps on each line. Can you solve it so both answers come to 10?

  •  (◯+◯–◯)×◯ = 10
  •  (◯–◯)×◯–◯ = 10

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The 7puzzle Challenge

The playing board of the 7puzzle game is a 7-by-7 grid containing 49 different numbers, ranging from up to 84.

The 3rd & 4th rows of the playing board contain the following fourteen numbers:

3     10     13     25     32     35     36     42     44     45     54     60     66     80

List THREE different numbers that have a sum of 77.

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Answers

. . . can be found when clicking this.

7puzzleblog

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DAY 110:

Today’s Challenge

A 7-step question – can you work out the correct answer at the end of the 7th step?

  1.  Work out the sum of 4 and 6,
  2.  Calculate the product of 4 and 6,
  3.  Find the difference between the two answers in points 1 and 2,
  4.  Square the answer to point 3,
  5.  Subtract 75 from your answer in point 4,
  6.  Find the Square Root of your answer in point 5,
  7.  Multiply your answer in point 6 by 10.

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The 7puzzle Challenge

The playing board of the 7puzzle game is a 7-by-7 grid containing 49 different numbers, ranging from up to 84.

The 1st & 2nd rows of the playing board contain the following fourteen numbers:

2     8     9     14     15     17     22     28     40     48     55     63     64     72

What is the product of the smallest and largest numbers on this list?

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Answers

. . . can be found when clicking this.

7puzzleblog

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DAY 109:

Today’s Challenge

A last chance to get all seven correct, but be careful as there are one or two tricky ones!

  1. (1 – 2) – (3 – 4) = ?
  2. 54 – 31 = ?
  3. What is 25 less than the product of 20 and 10?
  4. How do you write “Six and six hundredths” in decimal format?
  5. 4,000 × 0.02 = ?
  6. What is 10% of £13?
  7. What is 31 × 15?

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The 7puzzle Challenge

The playing board of the 7puzzle game is a 7-by-7 grid containing 49 different numbers, ranging from up to 84.

The 1st & 2nd rows of the playing board contain the following fourteen numbers:

2     8     9     14     15     17     22     28     40     48     55     63     64     72

What is the sum of the odd numbers?

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Answers

. . . can be found when clicking this.

7puzzleblog

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DAY 108:

Today’s Challenge

Here’s seven more mental arithmetic questions to try.  Can you get all seven correct?

  1. (11 – 5) – (4 + 1) = ?
  2. What is 10 more than –4?
  3. 47 × 4 = ?
  4. 0.32 ÷ 4 = ?
  5. 5 7/8 – 3 3/8 = ?
  6. Which one is bigger: 2 cubed or 3 squared?
  7. You wish to buy two £30 items. Which offer would give you the best deal: (A) 15% off both items, (B) 2nd item is 40% off, (C) buy one, get one half-price, (D) 25% off 1st item, 10% off 2nd item.

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The 7puzzle Challenge

The playing board of the 7puzzle game is a 7-by-7 grid containing 49 different numbers, ranging from up to 84.

The 1st & 2nd rows of the playing board contain the following fourteen numbers:

2     8     9     14     15     17     22     28     40     48     55     63     64     72

 

From the list, find TWO numbers that have a sum of 111.

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Answers

. . . can be found when clicking this.

7puzzleblog

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DAY 107:

Today’s Challenge

Here’s seven tricky mental teasers to try:

  1. (18 – 5) – (7 – 17) = ?
  2. 128 + 294 = ?
  3. How many seconds are in a quarter-of-an-hour?
  4. How many degrees are in three-quarters of a circle?
  5. (16 – 8) × (13 – 8) = ?
  6. On four consecutive days, you spend £55, £74, £36 and £15. What is the average amount spent per day?
  7. What is 15% of £8?

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The 7puzzle Challenge

The playing board of the 7puzzle game is a 7-by-7 grid containing 49 different numbers, ranging from up to 84.

The 1st & 2nd rows of the playing board contain the following fourteen numbers:

2     8     9     14     15     17     22     28     40     48     55     63     64     72

Which two numbers have a difference of 42?

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Answers

. . . can be found when clicking this.

7puzzleblog

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DAY 106:

Today’s Challenge

Here are seven mental arithmetic questions for you to try:

  1. Which number multiplied by itself gives 196?
  2. What is 50 + 400 + 5?
  3. 12 + 34 = ?
  4. If Jo can run 10 miles in one hour, how far would she run in 15 minutes running at the same rate?
  5. (14 – 3) × (7 + 2) = ?
  6. Which fraction comes next in the list: 2/3, 4/6, 6/9, …
  7. How many days equal 6 weeks?

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The 7puzzle Challenge

The playing board of the 7puzzle game is a 7-by-7 grid containing 49 different numbers, ranging from up to 84.

The 1st & 2nd rows of the playing board contain the following fourteen numbers:

2     8     9     14     15     17     22     28     40     48     55     63     64     72

List FIVE different numbers that total 100.

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Answers

. . . can be found when clicking this.

7puzzleblog

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DAY 105:

Today’s Challenge

How quickly can you correctly answer the following seven questions?

  1.  (17 – 4) + (12 – 9) = ?
  2.  (3 – 2) – (16 – 16) = ?
  3.  What is Seven and seven-eighths minus Four-and-a-half?
  4.  109 + 10 = ?
  5.  (3 + 16) + (16 + 9) = ?
  6.  (11 – 5) + (4 + 1) = ?
  7.  What is the perimeter of a 13cm by 13cm square?

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The 7puzzle Challenge

The playing board of the 7puzzle game is a 7-by-7 grid containing 49 different numbers, ranging from 2 up to 84.

The 2nd & 5th rows of the playing board contain the following fourteen numbers:

6     7     8     16     17     21     28     48     50     55     63     64     81     84

Which two numbers in the list are cube numbers?

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Answers

. . . can be found when clicking this.

7puzzleblog

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