There are always one or two questions on algebra in the KS2 Maths Reasoning Papers and this year one question looked at sequences. The rule to get the numbers was given but some of the numbers were missing e.g.
Rule: multiply by 2 and then add 3
Write the missing numbers:
?? 25 53 ??
Finding the last number in the sequence is easy; just follow the rule by multiplying 53 by 2 making 106 and then adding 3. Answer: 109.
It is the first number which is harder to find. Because it is the first number in the sequence a child will need to look at the second number (25) and work in reverse:
subtract 3 from 25, making 22 and then divide by 2 to get 11.
One mark for each answer in the test. This question could easily fluster children, but we have just published a whole series of similar questions in our maths Booster section, well worth a look if your child is going to be taking the test next year.