Playing with Numbers

Crossword

Complete the following puzzle:

3. Crossword

Make the crossword here.

Across:

1. Two natural numbers are coprime if their HCF is _________.

2. A number is divisible by _________ if its ones placedigit is either 5 or 0.

3. LCM of 2 and 4 is _________

4. 1 is neither a _________ nor composite number.

Down:

5. 2 consecutive odd prime numbers are known as _________.

6. A number is divisible by _________ it the number is divisible by 2 and 3 both.

7. _________ is the only even prime numbers.

8. HCF of 7 and 28 is _________.

3. Crossword

Make the crossword here.

Across:

1. Two natural numbers are coprime if their HCF is ONE.

2. A number is divisible by FIVE if its ones place digit is either 5 or 0.

3. LCM of 2 and 4 is FOUR

4. 1 is neither a PRIME nor composite number.

Down:

5. 2 consecutive odd prime numbers are known as TWIN.

6. A number is divisible by SIX it the number is divisible by 2 and 3 both.

7. TWO is the only even prime numbers.

8. HCF of 7 and 28 is SEVEN.

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Knowing Our Numbers

Crossword

Complete the following puzzle:

Across:

2. Value of Indian System equivalent to 1 million.

6. General 5 digit number using 9, 8, 7.

4. Expressing a number that is one less than 100, in words.

8. 2, 4, 6,.........

Down:

1. Successor of 10378695

3. Place of International System of numeration after Ones and Tens.

5. Greatest one digit number.

7. Number of zeroes in one thousand.

Suggestion: Crossword can be related to any concept in this chapter.

Across:

2.) Value of Indian System equivalent to 1 million. = 10 LAKH

6.) GREATEST 5 digit number using 9, 8, 7. =99887

4.) Expressing a number that is one less than 100, in words. = NINETY NINE

8.) 2, 4, 6,......... =EIGHT

Down:

1.) Successor of 10378695 = 10378696

3.) Place of International System of numeration after Ones and Tens. = HUNDREDS

5.) Greatest one digit number. = NINE

7.) Number of zeroes in one thousand. =THREE

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Puzzles for eyes only

By moving only one coin and using no others you can put five coins in each leg

CAN YOU TELL HOW MANY SQUARES ARE THERE?

Answer :

5 X 5 = 25

4 X 4 = 16

3 X 3 = 09

2 X 2 = 04

1 X 1 =01

SQUARES = 55

What number should be replaced in question mark?

Answer :

2 + 1 = 3

2 + 3 = 5 + 1 = 6

6+ 3 = 9 – 1 = 8

8 + 6 = 14 + 1 = 15

8 + 15 = 23 – 1 = 22

22 + 38 = 60 - 1 = 59

Answer is 59

CAN YOU TELL HOW MANY TRIANGLES ARE THERE?

ANSWER:

5 + 5 = 10

4 + 4 = 08

3 + 3 = 06

2 + 2 = 04

1 + 1 = 02

TRIANGLES = 30

What is the smallest number of ducks that can swim in this formation: two ducks in front of a duck. Two ducks behind a duck and a duck between two ducks?

3 ducks

A boat will carry only 100 kg.

How may a man weighing 100 kilograms and his sons, each of whom weighs 50 kilograms, use it to cross the river?

Answer: the sons go first. One brings back the boat and the father rows over. Then the other son returns for his brother.

A set of ten books is arranged in orderly fashion on a shelf. Each book has 100 pages making 1000 pages in all. A worm starting on the first page of the first book eats through the last page of the last book. How many pages has he eaten?

Answer: He ate 802. look at a row of books on the shelf. Why the worm did not touch 99 pages of the first and 99 of the last.

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