5
Numeration and Notation
Let’s represent
the number
2345.
Hundreds (H)
Units (U)
Tens (T)
Thousands (Th)
002
4
03
5 5 units = 5 x 1
0 4 tens = 4 x 10
0 3 hundreds = 3 x 100
0 2 thousands = 2 x 1000
The number 2345 can be represented on an abacus as follows:
2 3 4 5
Tip: Representing 4-digit numbers on an abacus
That is, 2345 = 2000 + 300 + 40 + 5
= (2 x 1000) + (3 x 100) + (4 x 10) + (5 x 1)
= 2 thousands + 3 hundreds + 4 tens + 5 units
In words, 2345 is written as: Two thousand three hundred and forty ve