We have already learnt numbers upto 9999. The greatest 4-digit number is 9999. If we add 1 to 9999 we get 10000 the smallest 5-digit number. We read 10000 as ten thousand. The greatest 5-digit number is 99999. Let us form 10000 with blocks of thousand each as shown below.
Let us represents 10000 on the abacus.
We can show
10000 on an abacus with five vertical rods. The rods represent place value of
ten thousands, thousands, hundreds, tens and ones. We add beads on the rods to show
different numbers. Each rod can hold up to 9 beads.
This shows 9 hundreds 9 tens and 9 ones. The number is 999.
If we add 1 more to 999 it is 10 hundreds. Regroup 10 hundreds as 1 thousand. 1 bead in the thousands place represents 1 thousand.
This shows 9 thousands 9 hundreds 9 tens and 9 ones. The number is 9999.
If we add 1 more to 9999 it is 10 thousands. Regroup 10 thousands as 1 ten thousand (TTh).
Let us represent a 5-digit number on the abacus.
1. Consider the number 13460. We can expand 13460 as shown here.
We read 13460 as thirteen thousand four hundred sixty.
We know the greatest 5-digit number is 99999, if we add 1 to 99999 we get 100000 the smallest 6-digit number. We read 100000 as one lakh. Lakh is also written as lac.
The sixth place from the right in the place value chart is lahks place.
The greatest 6-digit number is 999999.
2. Consider the number 976425. We can expand 976425 as shown here.
We read 976425 as nine lakh seventy-six thousand four hundred twenty-five.
Questions and Answers on 5 and 6-Digit Numbers:
1. Complete the following table.
(i) |
10000 |
1 ten thousand |
Ten thousand |
(ii) |
20000 |
_____ ten thousand |
_______________ |
(iii) |
30000 |
_____ ten thousand |
_______________ |
(iv) |
40000 |
_____ ten thousand |
_______________ |
(v) |
50000 |
_____ ten thousand |
_______________ |
(vi) |
60000 |
_____ ten thousand |
_______________ |
(vii) |
70000 |
_____ ten thousand |
_______________ |
(viii) |
80000 |
_____ ten thousand |
_______________ |
(ix) |
90000 |
_____ ten thousand |
_______________ |
(x) |
100000 |
_____ ten thousand |
_______________ |
Answers:
(ii) 2, twenty thousand
(iii) 3, thirty thousand
(iv) 4, forty thousand
(v) 5, fifty thousand
(vi) 6, sixty thousand
(vii) 7, seventy thousand
(viii) 8, eighty thousand
(ix) 9, ninety thousand
(x) 10, one lakh
2. Read the abacus and find the number.
(i)
(ii)
Answers:
(i) 48,407
(ii) 7,64,912
4th Grade Math Activities
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