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primary 5 | Maths
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What is the fastest way to do this kind of question? Thank you.
Date Posted: 6 years ago
Views: 1345
One way is to do your typical addition working.
Another way goes like this :
For 4 ◆ 10 ,
It's 4 + 44 + 444 + ... + 444 444 444 + 4 444 444 444
1. There are ten 4's in the ones' place.
So 10 x 4 = 40
Write a 0, carry over the 4 to the tens' place.
2.There are nine 4's in the tens' place.
So 9 x 4 = 36. 36 + 4 that was carried over = 40
Write a 0, carry over the 4 to the hundreds' place.
3. Repeat this until you reach the 4 in the billions' place (there's only one of it)
Another way goes like this :
For 4 ◆ 10 ,
It's 4 + 44 + 444 + ... + 444 444 444 + 4 444 444 444
1. There are ten 4's in the ones' place.
So 10 x 4 = 40
Write a 0, carry over the 4 to the tens' place.
2.There are nine 4's in the tens' place.
So 9 x 4 = 36. 36 + 4 that was carried over = 40
Write a 0, carry over the 4 to the hundreds' place.
3. Repeat this until you reach the 4 in the billions' place (there's only one of it)
Thank you so much.
See 2 Answers
done
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1) try and spot a pattern
2) test out pattern if it works
3) write it all down clearly
2) test out pattern if it works
3) write it all down clearly
Date Posted:
6 years ago
This answer is for another question
Sorry, this is not my question.
done
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This is the right one
Date Posted:
6 years ago
Thank you.
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