Page 28 - MathGenius-C1-Flipbook

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\ 03-Oct-2025 Bharat Arora Proof-9 Reader’s Sign _______________________ Date __________

Numbers oN the AbACus

Tens Ones
Look at the picture shown alongside. It shows an
abacus. We use an abacus with two spikes to show
It is
2-digit numbers. for tens. for ones.
It is
Let us show some 2-digit numbers on the abacus. t O

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 on the tens spike 1 bead on the tens spike 1 bead on the tens spike

shows 1 ten and no bead shows 1 ten and 5 beads shows 1 ten and 8 beads
on the ones spike shows on the ones spike shows on the ones spike shows
0 ones. 5 ones. 8 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 beads on each abacus to show the given numbers.

(a) (b) (c)

Challenge Question

Write the number 17 as tens
t O t O t O
and ones in two different ways
16 11 19 using only smaller numbers.

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