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Activities/Abacus
(view source)
Revision as of 10:05, 8 April 2010
11 bytes added
,
10:05, 8 April 2010
→Addition
Line 58:
Line 58:
<gallery>
<gallery>
File:Abacus-plus-4.png|4
File:Abacus-plus-4.png|4
−
File:Abacus-plus-3.png|+3 (5–2=3)
+
File:Abacus-plus-3.png|+3
=7
(5–2=3)
−
File:Abacus-plus-5.png|+5
+
File:Abacus-plus-5.png|+5
=12
File:Abacus-12.png|carry 5s to next column
File:Abacus-12.png|carry 5s to next column
−
File:Abacus-plus-19.png|+19 (20-1=19)
+
File:Abacus-plus-19.png|+19
=31
(20-1=19)
−
File:Abacus-plus-24.png|+24
+
File:Abacus-plus-24.png|+24
=55
File:Abacus-55.png|4+3+5+19+24=55
File:Abacus-55.png|4+3+5+19+24=55
</gallery>
</gallery>
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