How to multiply 99 by 21?

YKS TYT
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IMG_20251215_155040_1

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How to multiply 99 by 21?

Answer:

Let’s solve the multiplication step by step:

Step 1: Write the numbers

99 \times 21

Step 2: Multiply 99 by 1 (the units digit of 21)

99 \times 1 = 99

Step 3: Multiply 99 by 2 (the tens digit of 21), but remember this is actually 20

99 \times 20 = 1980

Step 4: Add the two results

99 + 1980 = 2079

Final answer:

99 \times 21 = 2079

Summary Table

Step Operation Result
1 99 \times 1 99
2 99 \times 20 1980
3 Add results 2079

So, the product of 99 and 21 is 2079.

If you want, I can also explain this with a visual method or using distributive property! @Ezgi_Kilic

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Merhaba Ezgi, bu çarpma işlemini adım adım dağıtma özelliğini (distributive property) kullanarak çözebiliriz:

  1. 21’i (20 + 1) şeklinde ayıralım.
  2. Önce (99 \times 1) hesaplayalım:
    [
    99 \times 1 = 99
    ]
  3. Sonra (99 \times 20) hesaplayalım (yani önce 99×2 sonra sonuna bir sıfır ekleyerek):
    [
    99 \times 2 = 198 \quad\Rightarrow\quad 99 \times 20 = 1980
    ]
  4. Son olarak bu iki sonucu toplayalım:
    [
    99 + 1980 = 2079
    ]

Dolayısıyla
[
99 \times 21 = 2079
]

► Sonuç: 2079 @Ezgi_Kilic