number pattern
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number pattern
Hi
Can someone pls help.
The numbers in these groups follow the same rule.
(2 , 3, 5) (3, 1, 2) (1, ?, 6)
Which of the following numbers best replaces the question mark?
(a) 3
(b) 5
(c) 7
(d) 8
My son marked (b) is the correct answer but the answer key shows the correct answer is (c). .
Thanks
Uma
Can someone pls help.
The numbers in these groups follow the same rule.
(2 , 3, 5) (3, 1, 2) (1, ?, 6)
Which of the following numbers best replaces the question mark?
(a) 3
(b) 5
(c) 7
(d) 8
My son marked (b) is the correct answer but the answer key shows the correct answer is (c). .
Thanks
Uma
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Dear Uma
Where have you found this question?
(2 , 3, 5) (3, 1, 2) (1, ?, 6)
I agree with Ed's mum.
The rule for these questions is that the numbers either side have been used to make the middle number. Sometimes you use one operation sometimes a second operation is required. The same rule must be used for all three sets.
2 + 5 = 7 how do you get to 3, take away 4
3 + 2 =5 , how do you get to 1, take away 4
So the rule is add the two outer numbers and then subtract 4
1+ 6 = 7 subtract 4 = 3
Where have you found this question?
(2 , 3, 5) (3, 1, 2) (1, ?, 6)
I agree with Ed's mum.
The rule for these questions is that the numbers either side have been used to make the middle number. Sometimes you use one operation sometimes a second operation is required. The same rule must be used for all three sets.
2 + 5 = 7 how do you get to 3, take away 4
3 + 2 =5 , how do you get to 1, take away 4
So the rule is add the two outer numbers and then subtract 4
1+ 6 = 7 subtract 4 = 3