Page 40 - MTH 1
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Showing Number on Abacus
An abacus is a counting device. It has rods and
beads. For two-digit numbers, it has two spikes.
The left spike represents Tens. tens ones
The right spike represents Ones.
See the representation of 1 to 20 on abacus.
T O T O T O T O T O
1 2 3 4 5
T O T O T O T O
6 7 8 9
T O T O T O T O T O T O
10 11 12 13 14 15
T O T O T O T O T O
16 17 18 19 20
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Mathematics In Focus - 1
