Numeration - 2 - Free MCQ Practice Test with solutions, Class 4 Mathematics

• Commas are used to separate large numbers into smaller, more readable sections.
• For example, one million is written as 1,000,000, where commas separate the thousands, millions, etc.
• This makes it easier to read and understand the number at a glance.

The number 99,999 has five digits because it is composed of five 9s (9-9-9-9-9).

The greatest n-digit number is formed by all 9s. Thus, 99,999 is the greatest 5-digit number.

• The smallest 6-digit number is 100000, which is written as 1,00,000.
• This number starts with a 1 and is followed by five zeros, making exactly 6 digits.
• Any number lower than 100000 will have 5 digits or less.
• Thus, option b is the correct answer.

• Start with the largest number: 300,000.
• Add 20,000 to it: 300,000 + 20,000 = 320,000.
• Add 4,000: 320,000 + 4,000 = 324,000.
• Add 200: 324,000 + 200 = 324,200.
• Add 20: 324,200 + 20 = 324,220.
• Add 2: 324,220 + 2 = 324,222.
• The final result is 324,222.

In the International system of numeration, all the periods have three place values each. Since each period has three place values, so to write a number with the help of comma(s), we have to put a comma after every three digits from the right.
We are asked about the places in one’s period. Since it is the first period, starting from the right we have ones, tens and hundreds

So, the correct answer is “Option B”.

Instead of putting comma, we can leave space to separate the periods.

• The Indian numbering system divides numbers into periods like ones, thousands, lakhs, and crores.
• Ten lakhs is written as 10,00,000, where the "lakhs" period represents numbers grouped in lakhs.
• Therefore, ten lakhs come in the lakhs period, making option b the correct answer.

• To solve 6, 46, 555, we break down the numbers:
• 6 represents 6 in the ones place.
• 46 represents 40 (4 in the tens place) and 6 (in the ones place).
• 555 represents 500 (5 in the hundreds place), 50 (5 in the tens place), and 5 (in the ones place).
• When combined, it equals: 600000 + 40000 + 6000 + 500 + 50 + 5.
• This matches the first option, making it the correct answer.

• One lakh represents the number 100,000.
• In the Indian numbering system, it is written with commas as 1,00,000.
• Option a correctly displays this figure.
• Other options either have incorrect placement of commas or incorrect total value.

• 4 is in the lakh place, so it reads as "Four lakh."
• 23 is in the thousand place, so it is "Twenty-three thousand."
• 456 is broken down into hundreds, tens, and units: "Four hundred," "Fifty," and "Six."
• Combining these gives: "Four lakh twenty-three thousand four hundred fifty-six."