CBSE Class 3 Mathematics Practice Worksheet Set 05

Q-1) Paste strips of glaze paper to show the following Roman Numerals. 34, 23, 16, 28, 15, 39
Answer: Roman numerals are formed by combining symbols and adding or subtracting their values using the following standard base values: I = 1, V = 5, X = 10, L = 50.
To represent these numbers using glaze paper strips or tally notation (tens and ones):
- 34 = XXXIV (Three tens and four ones: \(10 + 10 + 10 + 4 = 34\))
- 23 = XXIII (Two tens and three ones: \(10 + 10 + 3 = 23\))
- 16 = XVI (One ten and six ones: \(10 + 6 = 16\))
- 28 = XXVIII (Two tens and eight ones: \(10 + 10 + 8 = 28\))
- 15 = XV (One ten and five ones: \(10 + 5 = 15\))
- 39 = XXXIX (Three tens and nine ones, written as 10 less than 40: \(30 + 9 = 39\))
In simple words: Break down each number into tens (X) and ones to visualize how Roman numerals are constructed.

Exam Tip: Remember that symbols I, X, and C can be repeated up to three times consecutively, but smaller values placed before larger values mean subtraction.

Q-2) Solve and write the answers in Roman Numerals.
XXI + III =
XXVI - IX =
XIX + VIII =
XXVIII - IV =
Answer:
- XXI + III = 21 + 3 = 24 = XXIV
- XXVI - IX = 26 - 9 = 17 = XVII
- XIX + VIII = 19 + 8 = 27 = XXVII
- XXVIII - IV = 28 - 4 = 24 = XXIV
In simple words: Convert Roman numerals to Hindu-Arabic numbers, perform the addition or subtraction, and then convert the result back into Roman numerals.

Exam Tip: Always double check subtraction problems where you might need to borrow or expand symbols before subtracting.

Q-3) What comes before, after and between?
VIII [          ]
XIX [          ]
[          ] XXX
XXVIII [          ] XXVI
Answer:
- After VIII: IX
- After XIX: XX
- Before XXX: XXIX
- Between XXVIII and XXVI: XXVII
In simple words: Find the sequence of Roman numerals by counting forward (after/between) or backward (before).

Exam Tip: Keep the standard sequence of numbers in mind: IX comes after VIII, and XXIX comes right before XXX.

Q-4) Arrange in ascending order.
XXV     XIX     IX     XXVI     XXI
Answer:
Converting the Roman numerals to standard numbers for comparison:
- XXV = 25
- XIX = 19
- IX = 9
- XXVI = 26
- XXI = 21
Ascending order (smallest to largest): 9, 19, 21, 25, 26
In Roman Numerals: IX, XIX, XXI, XXV, XXVI
In simple words: Arrange the numbers from the smallest value to the largest value.

Exam Tip: Converting Roman numerals to regular numbers first makes it much easier to compare and sort them correctly.

Q-5) Colour CENTRAL BLOCK:
RED IF A > B
GREEN IF A < B

Column A          Central Block          Column B
XXV                  [          ]                  XXVII
XXIV                  [          ]                  XVI
XII                  [          ]                  X
XXXIV                  [          ]                  XXXVI
Answer:
Comparing each pair of values from Column A and Column B:
- XXV (25) and XXVII (27): Since \(25 < 27\), colour is GREEN
- XXIV (24) and XVI (16): Since \(24 > 16\), colour is RED
- XII (12) and X (10): Since \(12 > 10\), colour is RED
- XXXIV (34) and XXXVI (36): Since \(34 < 36\), colour is GREEN
In simple words: Compare the two Roman numbers in each row. If the first number is bigger, color it red; if it is smaller, color it green.

Exam Tip: Convert both sides to standard numbers first to avoid making mistakes in inequality comparisons.