Page 23 - Touchpad Mathematics V1.0 C1

D:\Working\TouchPad_Maths\TouchPad_Maths_1\Open_Files\Chap_02\Chap_02
\ 17-Nov-2025 Surender Singh Rothan Proof-7 Reader’s Sign _______________________ Date __________

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 the tens spike 1 bead in the tens spike 1 bead in the tens spike
shows 1 ten and no shows 1 ten and 5 shows 1 ten and 8

beads in the ones spike beads in the ones spike beads in the ones spike
means 0 ones. means 5 ones. means 8 ones.

Exercise 2D

1. Write the numbers shown on the abacus. One has been done for you.
a. b. c. d.

T O T O T O T O

17

2. draw beads to show the given numbers.

a. b. c. d.

T O T O T O T O

15 16 18 19

21
Numbers up to 20