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\ 11-Sep-2024 Bharat Arora Proof-6 Reader’s Sign _______________________ Date __________

Numbers oN the AbACus Tens Ones

Look at the picture shown alongside. It is an abacus.
We use an abacus with two spikes to show 2-digit It is It is

numbers. for tens. for ones.
t O
Let us show some 2-digit numbers on the abacus.

10 has 1 ten and 0 ones. 15 has 1 ten and 5 ones. 18 has 1 ten and 8 ones.

t O t O t O

1 bead in tens spike 1 bead in tens spike 1 bead in tens spike

shows 1 ten and no shows 1 ten and 5 beads shows 1 ten and 8 beads
beads in ones spike in ones spike means 5 in ones spike means 8
means 0 ones. ones. ones.

Practice time 2d

1. Complete the table. One has been done for you.

(a) (b) (c) (d)

Abacus
t O t O t O t O

1 7

Number 17

Number Name Seventeen

2. Draw the beads to show the given numbers.

(a) (b) (c) (d)

t O t O t O t O
12 16 11 19

26 Mathematics-1