Question 12 Marks
Give an example to show that every non-zero number is a factor of $0.$(Hint: $0 \div 5 = 0,$ but division by $0$ is not defined.)
Answer$0 = 1 \times 0 = 2 \times 0 3 \times 0 = ….$
View full question & answer→Question 22 Marks
Reva counted $7$ notes of $₹20$ equal to $₹140.$ Are $7$ and $20$ the factors of $140?$ If yes write other factors of $140.$
AnswerYes; $1, 2, 4, 5, 10, 14, 28, 35, 70, 140$
View full question & answer→Question 32 Marks
The numbers $17$ and $71$ are prime numbers having the same digits. Find two more such pairs.
Answer$13$ and $31;37$ and $73$
View full question & answer→Question 42 Marks
Build a number that has exactly four different prime factors.
Answer$2 \times 3 \times 5 \times 7 = 210$
View full question & answer→Question 52 Marks
What is the smallest multiple of the greatest $5-$digit number $?$
View full question & answer→Question 62 Marks
What is the greatest factor of the greatest $5-$digit number$?$
View full question & answer→Question 72 Marks
What is the greatest $2-$digit multiple of $3?$
View full question & answer→Question 82 Marks
What is the thirteenth multiple of $2?$
View full question & answer→Question 92 Marks
Ring the number$(s)$ by which $2400$ is divisible. $2\ 3\ 4\ 5\ 6$
Answer$2, 3, 4, 5 $ and $6$
View full question & answer→Question 102 Marks
Find the first three common multiples of $(a) \ 2$ and $3 \ (b) \ 6$ and $8.$
Answer$(a) \ 6, 12, 18$
$(b) \ 24, 48, 72$
View full question & answer→Question 112 Marks
Find the common factors of $(a) \ 8$ and $20 \ (b) \ 6, 15$ and $21.$
Answer$(a) \ 1, 13$
$(b) \ 1, 3$
View full question & answer→Question 122 Marks
Without actual division, tick (✔) the numbers that are divisible by $6.$
$46\ 216\ 126\ 154\ 308$
View full question & answer→Question 132 Marks
Tell without actual division that $2, 4, 5, 6, 8$ and $10$ are not factors of $219.$
Answer$219$ is odd but $2, 4, 6, 8$ and $10$ are even so these are not factors of $219.$ Further, $219$ has ones digit $9,$ so, $219$ is not a factor of $5.$
View full question & answer→Question 142 Marks
If a number is divisible by $9,$ then is it necessary to check its divisibility by $3?$ If not, why?
AnswerNo, as $3$ is a factor of $9.$
View full question & answer→Question 152 Marks
What are the $5$ consecutive $1-$digit numbers that divide $2520?$
View full question & answer→Question 162 Marks
List the factors of $10$ and $25.$ What factors are common to both the numbers?
AnswerFactors of $10$ are $1, 2, 5,$ and $10$. Factors of $25$ are $1, 5$ and $25$. Common factors of $10$ and $25$ are $1$ and $5.$
View full question & answer→Question 172 Marks
Check by division, the first number is factor : $7, 74$
View full question & answer→Question 182 Marks
Check by division, the first number is factor : $9, 100$
View full question & answer→Question 192 Marks
Check by division, the first number is factor : $9, 1089$
View full question & answer→Question 202 Marks
Check by division, the first number is factor : $11, 121$
View full question & answer→Question 212 Marks
Check by division, the first number is factor : $6, 164$
View full question & answer→Question 222 Marks
Check by division, the first number is factor : $15, 165$
View full question & answer→Question 232 Marks
Write all the factor pairs of: $216$
Answer$(1, 216), (2, 108), (3, 72), (4, 54), (6, 36), (8, 27), (9, 24), (12, 18)$
View full question & answer→Question 242 Marks
Write all the factor pairs of: $56$
Answer$(1, 56), (2, 28), (4, 14), (7, 8)$
View full question & answer→Question 252 Marks
Write all the factor pairs of: $55$
View full question & answer→Question 262 Marks
Write all the factor pairs of: $40$
Answer$(1, 40), (2, 20), (4, 10), (5, 8)$
View full question & answer→Question 272 Marks
Encircle the even numbers and cross out the odd numbers: $16, 150, 193, 301, 43295, 1659, 1007, 568, 9994$
AnswerEven numbers: $16, 150, 568, 9994;$
Odd numbers: $193, 301, 43295, 1659, 1007$
View full question & answer→Question 282 Marks
Construct factor trees: $200$
View full question & answer→Question 292 Marks
Construct factor trees: $64$
View full question & answer→Question 302 Marks
Construct factor trees: $40$
View full question & answer→Question 312 Marks
Construct factor trees: $13$
View full question & answer→Question 322 Marks
Find the prime factorisation: $512$
Answer$2 \times 2 \times 2 \times 2 \times 2 \times 2 \times 2 \times 2 \times 2$
View full question & answer→Question 332 Marks
Find the prime factorisation: $160$
Answer$2 \times 2 \times 2 \times 2 \times 2 \times 5$
View full question & answer→Question 342 Marks
Find the prime factorisation: $28$
Answer$2 \times 2 \times 7$
View full question & answer→Question 352 Marks
Find the prime factorisation: $19$
View full question & answer→Question 362 Marks
Find the factors : $117$
Answer$1, 3, 9, 13, 39, 117$
View full question & answer→Question 372 Marks
Find the factors : $84$
Answer$1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84$
View full question & answer→Question 382 Marks
Find the factors : $48$
Answer$1, 2, 3, 4, 6, 8, 12, 16, 24, 48$
View full question & answer→Question 392 Marks
Find the factors : $25$
View full question & answer→Question 402 Marks
Obtain the factorisation by $(i)$ factor tree method and $(ii)$ division method.: $765$
Answer$765 = 3 \times 3 \times 5 \times 17$
View full question & answer→Question 412 Marks
Obtain the factorisation by $(i)$ factor tree method and $(ii)$ division method.: $400$
Answer$400 = 2 \times 2 \times 2 \times 2 \times 5 \times 5$
View full question & answer→Question 422 Marks
Obtain the factorisation by $(i)$ factor tree method and $(ii)$ division method.: $250$
Answer$250 = 2 \times 5 \times 5 \times 5$
View full question & answer→Question 432 Marks
Obtain the factorisation by $(i)$ factor tree method and $(ii)$ division method.: $63$
Answer$63 = 3 \times 3 \times 7$
View full question & answer→Question 442 Marks
Obtain the factorisation by $(i)$ factor tree method and $(ii)$ division method.: $36$
Answer$36 = 2 \times 2 \times 3 \times 3$
View full question & answer→Question 452 Marks
Which of the given numbers divide $59320 \ ? $
View full question & answer→Question 462 Marks
Which of the given numbers divide $42356? 2, 3, 4, 5, 6, 9$
View full question & answer→Question 472 Marks
Write $2nd, 3rd, 5th, 7th$ and $10th$ multiples of the numbers:
$13$
Answer$26, 39, 65, 91, 130$
View full question & answer→Question 482 Marks
Write $2nd, 3rd, 5th, 7th$ and $10th$ multiples of the numbers:
$10$
Answer$20, 30, 50, 70, 100$
View full question & answer→Question 492 Marks
Write $2nd, 3rd, 5th, 7th$ and $10th$ multiples of the numbers:
$9$
Answer$18, 27, 45, 63, 70$
View full question & answer→Question 502 Marks
Write $2nd, 3rd, 5th, 7th$ and $10th$ multiples of the numbers:
$7$
Answer$14, 21, 35, 49, 70$
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