讲解一下这道题---Question Number: 1
Question Stem:
Which value is equivalent to 700,000 + 5,000 + 200 + 10 + 9 ?
Options:
A 705,209
B 705,219
C 750,209
D 750,219
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答案文本
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Let's solve this addition problem step by step. We need to find the value of seven hundred thousand plus five thousand plus two hundred plus ten plus nine. I'll show you how to organize this using place values.
Now let's perform the addition step by step. First, we align all numbers by their place values. Then we add column by column, starting from the rightmost column and working left. Seven plus zero plus zero plus zero plus nine equals nine in the ones place.
Let's break down each column. In the ones place, we have zero plus zero plus zero plus zero plus nine equals nine. In the tens place, zero plus zero plus zero plus one plus zero equals one. Continuing this pattern for all columns gives us seven zero five comma two one nine.
Now let's verify our answer by checking it against all the given options. Our calculated answer is seven zero five comma two one nine. Option A has seven zero five comma two zero nine, which is incorrect because the tens digit should be one, not zero. Option B matches our answer exactly. Options C and D both have seven five zero instead of seven zero five in the first three digits, making them incorrect.
To summarize our solution: We organized the numbers by place value, performed column-by-column addition from right to left, and calculated the sum as seven zero five comma two one nine. This matches option B exactly, making B the correct answer to this addition problem.