RBSE Solutions Class 6 Maths Chapter 1 Know the Numbers Exercise 1.1

Question 1. Write the following numbers in words.
(i) 5,782
(ii) 75,879
(iii) 3,89,087
(iv) 21,32,452
(v) 7,68,92,479
(vi) 50,60,798
Answer: The numbers written in words are:
(i) Five thousand seven hundred eighty-two
(ii) Seventy-five thousand eight hundred seventy-nine
(iii) Three lakh eighty-nine thousand eighty-seven
(iv) Twenty-one lakh thirty-two thousand four hundred fifty-two
(v) Seven crore sixty-eight lakh ninety-two thousand four hundred seventy-nine
(vi) Fifty lakh sixty thousand seven hundred ninety-eight. Knowing place values helps to write large numbers correctly.
In simple words: We write out each number by saying its value. For example, 5,782 is five thousand, seven hundred, eighty-two.

🎯 Exam Tip: Remember to use hyphens for numbers between twenty-one and ninety-nine (like 'eighty-two') when writing them in words.

Question 2. Write the following in form of numbers:
(i) Sixty eight thousand five hundred twenty nine
(ii) eighty nine thousand seventy nine
(iii) five lakh seventy two thousand fifty seven
(iv) Ninety lakh ninety thousand nine hundred ninety
(v) One crore, twenty one lakh, thirty one thousand forty one.
Answer: The numbers in numeral form are:
(i) 68,529
(ii) 89,079
(iii) 5,72,057
(iv) 90,90,990
(v) 1,21,31,041. When writing large numbers, it's useful to group digits with commas to make them easier to read.
In simple words: We change the words back into numbers. For example, 'sixty-eight thousand five hundred twenty-nine' becomes 68,529.

🎯 Exam Tip: Pay close attention to the place value words like 'thousand', 'lakh', and 'crore' to correctly place the digits in the number.

Question 3. Given the numbers 5, 7, 0, 6, 1, 3 and 4. Form five numbers of seven digits using these.
Answer: Using the digits 5, 7, 0, 6, 1, 3, and 4, five different seven-digit numbers can be formed. These digits can be arranged in many different ways to create unique numbers.
Here are five examples:
1630457
4753160
7105364
5047316
3507641
In simple words: Take the given numbers and mix them up to make five different new numbers, each having seven digits. You can arrange the digits in many orders to get different numbers.

🎯 Exam Tip: When forming numbers from a given set of digits, ensure each digit is used only once in each number, and remember that a number cannot start with zero if it's meant to be a seven-digit number.

Question 4. Put the symbols, <, > and = in the boxes given between the following numbers.
(i) 1403789 _ 140378
(ii) 560325 _ 560326
(iii) 732108 _ 732208
(iv) 32872015 _ 32852017
(v) 612345 _ 611345
Answer: After comparing the numbers, the correct symbols are:
(i) 1403789 > 140378 (The first number has more digits, making it larger)
(ii) 560325 < 560326 (560326 is one more than 560325)
(iii) 732108 < 732208 (The hundreds digit is smaller in 732108)
(iv) 32872015 > 32852017 (The lakhs place digit in 32872015 is greater than in 32852017)
(v) 612345 > 611345 (The thousands digit is greater in 612345). Always compare numbers from the leftmost digit with the highest place value.
In simple words: We put the correct symbol (greater than, less than, or equal to) between each pair of numbers. We compare them by looking at their digits from left to right.

🎯 Exam Tip: To compare large numbers, start by counting the number of digits. If they are different, the number with more digits is larger. If the digit count is the same, compare digits from left to right until you find a difference.

Question 5. Write the following numbers ascending order.
(i) 8435, 4835, 13584, 5348, 25843
(ii) 1100, 1001, 1011, 1010
(iii) 50500, 50050, 55555, 50505
(iv) 58695376, 58685376, 58695306, 58685378
Answer: Writing the numbers in ascending order (from smallest to largest):
(i) 4835 < 5348 < 8435 < 13584 < 25843
(ii) 1001 < 1010 < 1011 < 1100
(iii) 50050 < 50500 < 50505 < 55555
(iv) 58685376 < 58685378 < 58695306 < 58695376. Arranging numbers in order helps to understand their relative values.
In simple words: We line up the numbers from the smallest to the biggest. It's like putting things in order from shortest to tallest.

🎯 Exam Tip: For ascending order, think of climbing stairs: start from the bottom (smallest number) and go up. Compare numbers digit by digit, starting from the leftmost place.

Question 6. Write the given numbers in descending order:
(iv) 10001, 11001, 10101, 10011
(i) 9754, 8320, 847, 571
(ii) 6040, 4646, 4600, 4060
(iii) 38802, 36501, 25751, 9801
Answer: Writing the given numbers in descending order (from largest to smallest):
(i) 9754 > 8320 > 847 > 571
(ii) 6040 > 4646 > 4600 > 4060
(iii) 38802 > 36501 > 25751 > 9801
(iv) 11001 > 10101 > 10011 > 10001. Descending order is the opposite of ascending order.
In simple words: We arrange the numbers starting from the biggest and going down to the smallest. It's like going down a slide, from top to bottom.

🎯 Exam Tip: For descending order, think of going down stairs: start from the top (largest number) and go down. Compare numbers carefully from left to right to determine the largest ones first.