Question

Question 4 Using divisibility tests, determine which of the following numbers are divisible by 11: (a) 5445 (b) 10824 (c) 7138965 (d) 70169308 (e) 10000001 (f) 901153

Class 6 - Math - Playing with Numbers Page 57

Answer 1

Hello!
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Here is your answer
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A number is divisible by 11 when the alternating sun of the digits and then subtracted are divisible by 11 or equal to 0.

a) 5445
5+4 = 9
4+5 = 9
9-9 = 0

So, 5445 is divisible by 11
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b) 10824
1+8+4 = 13
0+2 = 2
13-2 = 11

So, 10824 is divisible by 11
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c) 7138965
7+3+9+5 = 24
1+8+6 = 15
24-15 = 9

So, 7138965 is not divisible by 11
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d) 70169308
7+1+9+0 = 17
0+6+3+8 = 17
17-17 = 0

So, 70169308 is divisible by 11
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e) 10000001
1+0+0+0 = 1
0+0+0+1 = 1
1-1 = 0

So, 10000001 is divisible by 11
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f) 901153
9+1+5 = 15
0+1+3 = 4
15-4 = 11

So, 901153 is divisible by 11
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Answer 2

Answer:

don't know soooooo srry