Question

B) Subtract.
1)
Tens Units
3
0
- 1
2​

Answer 1

Answer:

The minus sign ‘−‘ is used to denote a subtraction operation, such as 4 − 2 = 2. The '−' sign can be used multiple times as required: for example, 8 − 2 − 2 = 4.

This calculation is correct, but it can be simplified by adding together the numbers we are subtracting.  In our example, 8 − 2 − 2 = 4 can be simplified to 8 − 4 = 4 (the two 2s have been added together to give 4, which is then subtracted

Step-by-step explanation:

For example,

8 + 3 + 5 is the same as 3 + 8 + 5 and gives us the same answer, 16.

However, when we are performing a subtraction, we need to take extra care with the order of the numbers.

Usually with a subtraction, we write the number we are subtracting from first, and the numbers we are taking away in any order after that.

For example,

8 − 5 = 3

This is NOT the same as 5 − 8 = −3

We can see that we have the same numerical answer (3), but that its value is different: 3 in the first calculation, but minus 3 (−3) in the second.

Similarly 8 − 5 − 3 = 0, but 5 − 8 − 3 = −6, which is a completely different answer.

The reason that the answers are different is not because we have put the numbers in the ‘wrong’ order, but because we have not taken care to notice whether they are positive or negative.

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