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Explain how to make these calculations mentally.

a. [tex]99 + 54[/tex]

b. [tex]244 - 99[/tex]

c. [tex]99 \cdot 6[/tex]

d. [tex]99 \cdot 15[/tex]

Answer :

Sure! Here are some ways to calculate each of these problems mentally, using strategies that make mental math easier:

a. 99 + 54

1. Break 54 into easier parts: 50 and 4.
2. First, add 50 to 99, which is easy to do: 99 + 50 = 149.
3. Then, add the remaining 4: 149 + 4 = 153.

So, 99 + 54 = 153.

b. 244 - 99

1. To simplify, consider subtracting a round number close to 99, such as 100.
2. Subtract 100 from 244 to get 144.
3. Since we subtracted 1 extra (because 100 is 1 more than 99), add back 1: 144 + 1 = 145.

So, 244 - 99 = 145.

c. 99 × 6

1. Use a strategy involving 100, which is easy to work with: think of 99 as (100 - 1).
2. Calculate 100 × 6 = 600.
3. Then subtract 6 (because we're 1 short for each of the 6 groups): 600 - 6 = 594.

So, 99 × 6 = 594.

d. 99 × 15

1. Again, use the handy 100 strategy: think of 99 as (100 - 1).
2. Calculate 100 × 15 = 1500.
3. Then subtract 15 (because we're 1 short for each of the 15 groups): 1500 - 15 = 1485.

So, 99 × 15 = 1485.

These methods break the numbers into more manageable parts and use basic arithmetic operations, making it easier to solve mentally!

Thanks for taking the time to read Explain how to make these calculations mentally a tex 99 54 tex b tex 244 99 tex c tex 99 cdot 6 tex d tex. We hope the insights shared have been valuable and enhanced your understanding of the topic. Don�t hesitate to browse our website for more informative and engaging content!

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