PR-6102UK Investigating Number Patterns 3
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Noticing Nines – 1<br />
1 You'll be familiar with this?<br />
a Complete the nine times table.<br />
1 x 9 =<br />
2 x 9 =<br />
3 x 9 =<br />
4 x 9 =<br />
5 x 9 =<br />
6 x 9 =<br />
7 x 9 =<br />
8 x 9 =<br />
9 x 9 =<br />
10 x 9 =<br />
What do you notice<br />
about the tens?<br />
b Record your observations.<br />
What happens when<br />
you add the digits?<br />
e.g. 2 x 9 = 18<br />
1 + 8 = 9<br />
What do you notice<br />
about the ones?<br />
What do you notice<br />
about the answers?<br />
9 = 9<br />
1 + 8 = 9<br />
Viewing sample<br />
2 What happens if, instead of adding the digits in the answer, you subtract the<br />
smaller number from the larger? e.g. 4 x 9 = 36, 6 – 3 = 3.<br />
Describe the pattern that is formed.<br />
=<br />
=<br />
=<br />
=<br />
=<br />
=<br />
=<br />
=<br />
14 • <strong>Investigating</strong> <strong>Number</strong> patterns • © R.I.C. Publications ® • www.ricpublications.com.au •
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