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Activities/Abacus (view source)

Revision as of 09:05, 8 April 2010

11 bytes added ,  09:05, 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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