Number Patterns Worksheet Page 26
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28M22.
An explanation which gives a counter-example to illustrate that halving a number that ends
in 8 does not always give a number ending in 4, eg:
•
’18 doesn’t work’
•
‘It could end in a 9’
•
‘Double 49 is 98’
•
’58 ÷ 2 = 29’
•
‘Half of 8 is 4 but half of 18 doesn’t end in 4’
•
’18, 28, 38, 48, 58, 68 – only half of them work’
•
‘It has to have an even number of 10s, like 28 or 88’
•
‘38’
No mark is awarded for circling ‘No’ alone.
Do not accept vague or incomplete explanations, eg:
•
‘Half of them don’t’
•
‘Half of 28 is 14’
•
‘Double 44 is 88’
If ‘Yes’ is circled but a correct, unambiguous explanation is given,
then award the mark.
U1
[1]
M23.
Award TWO marks for a multiple of 15 which is greater than 100, eg
105 OR 120 OR 135 OR 150 OR 300
Accept more than one answer if all are correct.
If the answer is incorrect, award ONE mark for evidence of appropriate method, eg:
Accept for ONE mark 30, 45, 60, 75 OR 90
← Not spotting matching number (105)
← One step size incorrect (96 to 98)
← One step size incorrect (75 to 80)
← Multiple greater than 100 but not calculated
Answer need not be obtained for the award of ONE mark.
Up to 2
[2]
Page 26 of 28
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