Explain how to solve this problem to a Year 2 ---Textual Information:
The image contains a handwritten vertical subtraction problem and its result, along with annotations.
The structure appears as follows:
Above the top line: An "8" inside a box is positioned above the first column.
Top number: "7" and "0" are aligned horizontally, representing a number.
Operation and second number: A subtraction sign "-" is present, followed by "5" and "4" aligned horizontally below the "7" and "0" respectively. The "4" is crossed out.
Annotation near the second number: To the right of the crossed-out "4", there is an arrow pointing to a circle containing the number "1".
First horizontal line: A line is drawn below the top number and the second number.
Result: Below the first horizontal line, "3" (enclosed in a circle) and "6" are aligned horizontally, representing the result.
Second horizontal line: A line is drawn below the result.
Next calculation: Below the second horizontal line, parts of numbers from the next problem are visible: "1" below the first column and "0" below the second column.
Chart/Diagram Description:
Type: Arithmetic calculation layout (vertical subtraction) with handwritten annotations.
Elements:
- Numbers: Digits "8", "7", "0", "5", "4", "1", "3", "6", "1" (partial), "0" (partial) are present.
- Symbols: A subtraction sign "-".
- Lines: Two horizontal lines are drawn to separate sections of the calculation.
- Annotations:
- The number "8" is enclosed in a rectangle with a blue outline, placed above the number "7".
- The number "4" is marked with a cross-out.
- An arrow points from near the crossed-out "4" towards the right.
- The number "1" is enclosed in a circle, located to the right of the arrow.
- The number "3" is enclosed in an irregularly drawn circle, located below the number "5".
- Layout: Numbers and symbols are arranged in vertical columns, consistent with the traditional layout for performing long subtraction. The columns correspond to place values (tens on the left, ones on the right).
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答案文本
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Let's solve ninety minus fifty-four step by step. We'll use a method called borrowing when we can't subtract in a column. Look at our problem: we have nine tens and zero ones at the top, and we need to subtract five tens and four ones. But wait - in the ones column, we have zero minus four. Can we do that? No, because zero is smaller than four. This is where we need to borrow!
Now let's borrow from the tens column. The nine tens is happy to help! It gives one ten away to the ones column. So the nine tens becomes eight tens. The ten we borrowed is the same as ten ones. We bring these ten ones over to the ones column. Now we have zero ones plus ten ones equals ten ones altogether in the ones column.
Now we can subtract in the ones column! We have ten ones and we need to take away four ones. Ten minus four equals six. We write six in the answer space under the ones column. Great! We've solved the ones column.
Now let's subtract in the tens column. Remember, we started with nine tens but we gave one away, so we only have eight tens left. We need to take away five tens from these eight tens. Eight minus five equals three. We write three in the answer space under the tens column.
Now let's read our complete answer! We have three tens and six ones. Put the numbers together: three tens and six ones makes thirty-six! So ninety minus fifty-four equals thirty-six. Great job! You solved it using borrowing! Remember, when you can't subtract in a column, you can always borrow from the next column to help.