please can you help me as it is for my daughters homework which is needs handing in on monday!!!!!!!
2007-09-21 22:58:13 · 9 answers · asked by Beth 1 in Science & Mathematics ➔ Mathematics
Question a)
27 = 3 x 3 x 3
45 = 3 x 3 x 5
HCF = 9
Question b)
16 = 2 x 2 x 2 x 2
56 = 2 x 2 x 2 x 7
HCF = 8
2007-09-24 21:20:30 · answer #1 · answered by Como 7 · 0⤊ 0⤋
The best way to do these is to use a "tree" method for all the numbers. Let's do the first
27
|---|
3 9
| <=== (this line should be under the 9)
3 3
It does not show well here - but you will see the tree method gives you 27 in it''s LOWEST factors as 3x3x3. If you do the same for 45 you get 5x3x3.
Now to find the HIGHEST common fastor - look at the factors and see what they have the most in common. They both have 3x3 so your first answer is 9. The HCF for 27 and 45 is 9.
Let'd do b. 16 broken down using the tree is 2x2x2x2. Now, 56 broken down using the tree is 2x2x2x7. Now look at the factos and see what they have MOST in common for highest common factor. They both have 2x2x2 so your second answer is 8. The HCF for 16 and 56 is 8.
Hope this helps.
2007-09-22 10:04:46 · answer #2 · answered by pyz01 7 · 0⤊ 0⤋
hcf for a)27 and 45
= 3*3
= 9
hcf for b)16 and 56
= 2*2*2
= 8
2007-09-22 06:00:34 · answer #3 · answered by harry m 6 · 0⤊ 0⤋
a) 27= 3 X 3 X 3
45= 3X3X5
HCF = 3X3
= 9
b) 16= 2 X 2 X 2 X 2
56= 2X2X2X7
HCF= 2X2X2
= 8
2007-09-22 07:08:44 · answer #4 · answered by chicken_satay91 2 · 0⤊ 0⤋
Find all the factors of each of the following numbers and then identify the Highest Common Factor
a. 9 since factors of 27 are 3*3*3 and factors for 45 are 3*3*5, your hcf are 3*3, the answer is 9
b. 8
2007-09-22 06:16:35 · answer #5 · answered by criselda 3 · 0⤊ 0⤋
HCF-Highets common factor.So u gotta chek for that factor which is both highest and common in both numbers.
a.factors of 27 are:1,3,9,27 and 45 are:1,3,5,9,15,45.
thus HCf is 9.
b.16:1,2,4,8,16. and 56:1,2,4,7,8,14,28,56.
So HCF is 8.
another easy way is :
keep dividing the given numbers individually with the smalest number posible and keeping noting the questiont.
like:27=3*3*3 and 45=3*3*5
Now note the common factors and multiply them.Here,3*3=9.This givs u HCF.can b usd for large numbers
2007-09-22 06:21:00 · answer #6 · answered by aviral17 3 · 0⤊ 0⤋
a) 9
b) 8
2007-09-22 06:25:36 · answer #7 · answered by Clara 2 · 0⤊ 0⤋
(A) 27 and 45
gcf: 9
(B) 16 and 56
gcf: 8
2007-09-22 06:04:30 · answer #8 · answered by Jocel B. Bartolay 2 · 0⤊ 0⤋
a)9
b)8
highest common factor...not sure how to explain it. It is what it sounds like. The greatest factor that the given numbers have in common.
2007-09-22 06:01:09 · answer #9 · answered by Master Maverick 6 · 1⤊ 0⤋