RBSE Solutions Class 5 Maths Chapter 1 Numbers Exercise 1.1

Question 1. Write the following numbers in wrods-
(i) 24056
(ii) 40009
(iii) 99999
(iv) 80511
(v) 67725
Answer:
(i) 24056: Twenty four thousand fifty six
(ii) 40009: Forty thousand nine
(iii) 99999: Ninety nine thousand nine hundred ninety nine. It is the largest 5-digit number.
(iv) 80511: Eighty thousand five hundred eleven
(v) 67725: Sixty seven thousand seven hundred twenty five
In simple words: To write a number in words, read each part of the number (like thousands, hundreds, tens, and ones) and say it out loud. Then, just write what you say.

🎯 Exam Tip: Practice writing out different numbers to avoid spelling errors, especially for numbers like forty, fifty, and ninety.

Question 2. Write the expanded form of following numbers
(i) 12372
(ii) 23434
(iii) 45302
(iv) 75004
(v) 68877
Answer:
(i) 12372 = 10000 + 2000 + 300 + 70 + 2
(ii) 23434 = 20000 + 3000 + 400 + 30 + 4
(iii) 45302 = 40000 + 5000 + 300 + 00 + 2. Notice that the zero in the tens place is written as 00.
(iv) 75004 = 70000 + 5000 + 000 + 00 + 4
(v) 68877 = 60000 + 8000 + 800 + 70 + 7
In simple words: The expanded form shows a number as the sum of its place values. Each digit is multiplied by its place (like thousands, hundreds, tens, ones), and then all these parts are added together.

🎯 Exam Tip: Remember to include a zero for any place value where the digit is zero, such as in the hundreds or tens place.

Question 3. Write the equivalent numbers of following expanded forms -
(i) 40000 + 5000 + 700 + 70 + 2
(ii) 60000 + 0000 + 000 + 20 + 6
(iii) 30000 + 9000 + 900 + 00 + 8
(iv) 50000 + 2000 + 800 + 10 + 1
(v) 80000 + 0000 + 000 + 00 + 8
Answer:
(i) 40000 + 5000 + 700 + 70 + 2 = 45772
(ii) 60000 + 0000 + 000 + 20 + 6 = 60026
(iii) 30000 + 9000 + 900 + 00 + 8 = 39908
(iv) 50000 + 2000 + 800 + 10 + 1 = 52811. When combining, add the tens and ones places carefully.
(v) 80000 + 0000 + 000 + 00 + 8 = 80008
In simple words: To find the number from its expanded form, just add all the parts together. Each number in the expanded form represents a digit's value at a certain place.

🎯 Exam Tip: Always align the numbers correctly by their place values (ones, tens, hundreds, etc.) before adding them up to avoid mistakes.

Question 4. Find out the place value of 6 and 2 in the following numbers -
(i) 28506
(ii) 36265
(iii) 52266
(iv) 69242
(v) 82563
Answer:
(i) In 28506:
    Place value of 6 = 6 (ones place)
    Place value of 2 = 20000 (ten thousands place)
(ii) In 36265:
    Place value of 6 = 6000 (thousands place)
    Place value of 6 = 60 (tens place)
    Place value of 2 = 200 (hundreds place)
(iii) In 52266:
    Place value of 6 = 60 (tens place)
    Place value of 6 = 6 (ones place)
    Place value of 2 = 2000 (thousands place)
    Place value of 2 = 200 (hundreds place)
(iv) In 69242:
    Place value of 6 = 60000 (ten thousands place)
    Place value of 2 = 200 (hundreds place)
    Place value of 2 = 2 (ones place)
(v) In 82563:
    Place value of 6 = 60 (tens place)
    Place value of 2 = 2000 (thousands place)
In simple words: The place value of a digit is how much it is worth based on its position in the number. For example, a '6' in the tens place is worth 60, but a '6' in the thousands place is worth 6000.

🎯 Exam Tip: Always identify the position of the digit (ones, tens, hundreds, etc.) and multiply the digit by its place value to find its exact worth.

Question 5. Mark the right symbol (<, >, =) between the given numbers
(i) 2979 .......... 2932
(ii) 5423 .......... 5432
(iii) 8952 .......... 8952
(iv) 6850 .......... 6852
(v) 3675-3675
(vi) 9821 .......... 9799
Answer:
(i) 2979 > 2932 (2979 is greater than 2932)
(ii) 5423 < 5432 (5423 is smaller than 5432)
(iii) 8952 = 8952 (8952 is equal to 8952)
(iv) 6850 < 6852 (6850 is smaller than 6852)
(v) 3675 = 3675 (3675 is equal to 3675)
(vi) 9821 > 9799 (9821 is greater than 9799)
In simple words: We use symbols to compare numbers. '>' means 'greater than', '<' means 'less than', and '=' means 'equal to'. We compare numbers digit by digit, starting from the leftmost side.

🎯 Exam Tip: When comparing numbers, always start from the digit with the highest place value (the leftmost digit) and move to the right until you find a difference.

Question 6. Write the following numbers in ascending order -
(i) 26886, 37725, 30840, 25975, 40021
(ii) 59307, 53907, 59703, 57039, 57903
(iii) 74443, 74434, 74344, 77444, 77555
Answer:
(i) 25975, 26886, 30840, 37725, 40021
(ii) 53907, 57039, 57903, 59307, 59703
(iii) 74344, 74434, 74443, 77444, 77555. Arranging numbers from smallest to largest helps in understanding their relative values.
In simple words: Ascending order means arranging numbers from the smallest to the largest. Think of it like climbing stairs, you go up from bottom to top.

🎯 Exam Tip: To correctly arrange numbers in ascending order, compare them digit by digit starting from the leftmost place value. If the first digits are the same, compare the next ones.

Question 7. Write the following numbers in descending order -
(i) 51425, 50925, 42325, 41525, 34152
(ii) 86067, 85032, 82511, 81316, 81154
(iii) 76543, 76435, 74653, 74356, 73456
Answer:
(i) 51425, 50925, 42325, 41525, 34152
(ii) 86067, 85032, 82511, 81316, 81154
(iii) 76543, 76435, 74653, 74356, 73456. This means the largest number comes first, and the smallest comes last.
In simple words: Descending order means arranging numbers from the largest to the smallest. Imagine walking down stairs; you start at the top and go to the bottom.

🎯 Exam Tip: Always start by finding the largest number first, then the next largest, and so on, until all numbers are placed in order.