1st month : a decrease of $ 2500
2nd month : an increase of $2700
3rd month : a decrease of $350
Find the total increase or decrease in his account.
更新1:
Why " Using the concept of direct numbers to think " ?
更新2:
I understand la ~ Thx~
Help me , plz !!! (math)
2013-09-23 3:32 am
Samuel has recorded the increase/decrease in amount in his account in the past three months.
1st month : a decrease of $ 2500
2nd month : an increase of $2700
3rd month : a decrease of $350
Find the total increase or decrease in his account.
1st month : a decrease of $ 2500
2nd month : an increase of $2700
3rd month : a decrease of $350
Find the total increase or decrease in his account.
回答 (1)
2013-09-23 3:52 am
✔ 最佳答案
Using the concept of direct numbers to think,1st month : a decrease of $ 2500 => -2500
2nd month : an increase of $2700 => +2700
3rd month : a decrease of $350 => -350
Consider
(-2500) + (+2700) + (-350)
= -2500 + 2700 - 350
= 2700 - 2500 - 350
= 200 - 350
= -150
Therefore, the amount in his account is decreased by $150 over three months.
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