How to Memorize the Table of 21 Easily for Exams
FAQs on Table of 21 – Multiplication Table 21 with Tips & Examples
1. What is the table of 21 in Maths?
The table of 21, also known as the 21 times table or the multiplication table of 21, lists the products obtained by multiplying 21 by whole numbers. It's a fundamental concept in mathematics, helping students develop multiplication skills and understand patterns in numbers. Learning this table aids in quicker calculations and problem-solving.
2. How do I memorize the Table of 21 quickly?
Memorizing the 21 times table can be made easier using these techniques:
• **Identify Patterns:** Notice that the units digit of each multiple corresponds to the number being multiplied (e.g., 21 x 3 = 63 - the units digit is 3). The tens digits follow a pattern of doubling (2, 4, 6, 8...).
• **Break it Down:** Think of 21 as 20 + 1. Multiply the number by 20 and then add the number itself (e.g., 21 x 4 = (20 x 4) + 4 = 84).
• **Repeated Addition:** Add 21 repeatedly to itself (21 + 21 + 21 etc.) to find the multiples.
• **Practice Regularly:** Consistent practice through quizzes and exercises is key. Use flashcards or apps for quick revisions.
• **Visual Aids:** Create a visually appealing chart and refer to it regularly.
3. How far should I learn the 21 times table for exams?
For most exams, knowing the 21 times table up to 10 or 12 is sufficient. However, it's beneficial to practice up to 20 for a more comprehensive understanding and to enhance mental calculation speed. The exact requirement depends on your curriculum and the level of the examination.
4. Can I get a printable Table of 21 up to 100?
Yes, you can easily find printable 21 times tables online. Many educational websites offer downloadable worksheets and charts that list the multiples of 21 up to 100 or even higher. Vedantu also provides printable tables for students.
5. What are some real-life uses of the Table of 21?
The 21 times table isn't used directly in everyday life like smaller tables, but its application is broader than initially perceived. Mastering this table improves mental maths, which indirectly helps with:
• **Faster calculations:** This speeds up calculations when you need to add 21 repeatedly.
• **Problem-solving:** It aids in solving word problems involving multiplication and division involving 21.
• **Algebra:** Understanding multiples helps visualize number relationships, making algebra easier.
6. What is the pattern in the 21 times table?
The 21 times table has two notable patterns: The units digit of the product increases sequentially (1, 2, 3, 4…), and the tens digits increase in steps of two (2, 4, 6, 8… for the first nine multiples). This is an important memory aid.
7. Are there any tricks to quickly calculate multiples of 21?
Yes! One trick involves thinking of 21 as 20 + 1. Multiply the target number by 20 and then add the original number. For example, to calculate 21 x 6, multiply 6 by 20 (120) and add 6 (126). This method is faster than direct multiplication for larger numbers.
8. How can I use the 21 times table in word problems?
Word problems often involve scenarios requiring repeated addition or equal grouping. When you encounter a situation where items are repeated 21 times or grouped in sets of 21, the 21 times table can provide a quick solution. Practice these types of word problems using sample examples to see the table's practical use.
9. Why is learning multiplication tables important?
Learning multiplication tables is crucial for building a strong foundation in mathematics. It improves calculation speed, enhances problem-solving skills, and helps in understanding more complex mathematical concepts later on. It builds confidence and efficiency in mathematical tasks.
10. What are some alternative ways to learn the 21 times table besides rote memorization?
Instead of only rote learning, try these approaches:
• **Use visual aids:** Create a colorful chart or use online interactive games.
• **Group learning:** Work with friends or classmates.
• **Real-life applications:** Find examples in daily life to relate to the table.
• **Use technology:** Employ educational apps or websites that offer practice exercises and games.
11. How does the 21 times table relate to other multiplication tables?
Understanding that 21 is a multiple of 3 and 7 helps connect it to those tables. This understanding can facilitate memorization and improve number sense by identifying relationships between different tables.
12. Is there a specific order I should learn multiplication tables?
While there isn't a strictly prescribed order, it's generally recommended to start with smaller, simpler tables (2, 5, 10) before moving on to larger, less common tables like the 21 times table. The order depends on individual learning styles and pace.
