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Line 58:
Line 58: − + − + − + − +
→Addition
<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>