What's 70x1?

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mathsworkmusic | (Level 2) Educator

Posted on

When we write "What is 70 x 1?" we are saying 'What is 70 multiplied by 1?"

To multiply numbers, imagine the first number as rows of coins and the second as potential columns of coins.

If I have 70 coins lined up in 1 column this means that I have 70 coins. Each coin is the first and only coin in a row, and there are 70 rows.

If I have 70 coins lined up in 1 column and another 70 lined up in a 2nd column, this represents 70 (rows) multiplied by 2 (columns). I have 140 coins in total. Each time I add a new column of 70 coins, the 2nd number in the calculation increases by 1.

You can switch the rows and columns round, thereby swapping the two numbers in the calculation around, and you'll get the same result (70 x 1 is the same as 1 x 70 - both equal 70). You could physically move the coins so they look like a row rather than a column, or just stand somewhere else so that when you look at them they look like a row rather than a column. Extending that, if another person is standing so the coins look to them like they are in row, but you are standing so that the coins look to you like they are in a column, for you to agree how many coins there are (which you ought to, otherwise dividing the coins up fairly would be difficult), the result of the calculation must be the same whether the coins are lined up in columns or rows.

In general, arranging objects into shapes makes them easier to count. If the 70 coins were just strewn on the floor, neither of you would know how many there are, though you could make a guess. To save on space, and make them easier to count, you would probably arrange them as much like a square as possible. So I would arrange them in 10 rows (or columns) and 7 columns. Knowing that is equal to 70, you can just look at the 10 and 7 lengths of the shape and work it out.

I've referenced a page below with multiplication games that should be more fun than lining up coins!

Sources:
aishukul's profile pic

aishukul | Student, Grade 10 | (Level 3) Honors

Posted on

70 times 1= 70. Any number multiplied by 1 will give you that same number. This is because whenever you multiply, you add that many of that number. For example 70 times 2 can also be written as 70+70. When multiplying by 2, you are simply adding 70 two times. So, when you multiply 70 times 1, you it is just 70. So the answer is 70. 

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malkaam | Student, Undergraduate | (Level 1) Valedictorian

Posted on

70 * 1 = 70

Here's the thing when you multiply by a number by 1 the answer is always the same number, however if any number, even 1, is multiplied by 0 the answer is always 0.

Multiplication is how many times one number is added with the same number for example 70 * 2 = 70 + 70 = 140. 

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udonbutterfly | Student, College Freshman | (Level 1) Valedictorian

Posted on

Remember that any thing that is multiplied by 1 will always be the same number with was multiplied by. For example take c multiplied by 1 which will be

c x 1 = c No matter number c turns out the answer to the solution will be c.

The same thing goes for 70x1 the answer will be 70!

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ssandhu05 | Student, Undergraduate | (Level 2) Honors

Posted on

The answer is pretty simple; it's 70. Anything number multiplied by itself is that same exact number. For example, 2 times 1. The answer is 2 because, as said before, any number multiplied by 1 is that same number.

However, if you're having trouble looking at it because you don't know how to solve it, then you can always make a multiplication table or find one online to aid you whenever you need help with multiplication. However, a table that goes down to the number 70 will be pretty difficult to find, so just go with the rule said in the previous paragraph.

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ihatemath | Student, Grade 7 | eNotes Newbie

Posted on

70 

70*1= 70 

whatever number you multiply by one you get the same number back; EX: 2*1=2

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