Zapisujemy iloczyny i ilorazy oraz różnice wyników:

$7\cdot 5=35$  

$5\cdot 6=30$  

$35-30=5$    

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$8\cdot 9=72$  

$9\cdot 6=54$  

$72-54=18$  

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$28:4=7$  

$36:9=4$  

$7-4=3$  

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$7\cdot 6=42$  

$5\cdot 8=40$  

$42-40=2$  

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$7\cdot 8=56$  

$7\cdot 9=63$  

$63-56=7$  

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$45:5=9$  

$48:6=8$  

$9-8=1$  

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$8\cdot 8=64$  

$9\cdot 9=81$  

$81-64=17$  

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$7\cdot 4=28$  

$6\cdot 8=48$  

$48-28=20$  

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$72:9=8$  

$100:10=10$  

$10-8=2$