Activities/Abacus: Difference between revisions
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<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> | ||