This task is about spatial patterns and rules.
Miriam began making the diamond pattern below with matches.
 She noticed a relationship between the number of diamonds and the total number of matches used, which she recorded on a chart.
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a)
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Complete the table above to show the number of matches used, for each diamond pattern.
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How many matches would be needed for 20 diamonds? __________ matches.
You may show your working in the space below.
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c)
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What rule did you use to find the number of matches needed for 20 diamonds?
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