Question

14. Find the Error Hiroshi is determining -42 – (-37). Find his
mistake and correct it.
C - 42 - (-37) = 42-37

Answer 1

Answer:

Hiroshi's error was not having changed the sign of the number 37 by removing the parentheses and placing -37 instead of +37.

Step-by-step explanation:

we have

Hiroshi's work

$42-(-37)=42-37=5$

Remember that

a negative number is just a positive number multiplied by -1

and (-1)(-1)=+1

so

Correct work

$42-(-37)$

$42-(-1)(37)$

$42-(1)(-1)(37)$

$42+(-1)(-1)(37)$

$=42+37=79$

therefore

Hiroshi's error was not having changed the sign of the number 37 by removing the parentheses and placing -37 instead of +37.