"real world" intro to signed number expressions & computation
1. What's the temperature if it is 10° then drops 3°,
increases 2°, drops 6°, drops 2°, drops 1°,
increases 25°?
Scroll down to see computation. 10 - 3 + 2 - 6 - 2 - 1 + 25 +7 + 2 - 6 - 2 - 1 + 25 + 9 - 6 - 2 - 1 + 25 + 3 - 2 - 1 + 25 + 1 - 1 + 25 + 25°
2. What's the bank balance if the last banance was $145.00 and
you write a check for $50.50, a check for $12.60, and
two checks for $4, then deposit $253.85?
Scroll down to see computation. $145.00 - $50.50 - $12.60, - 2($4) + $253.85 $94.50 - $12.60, - 2($4) + $253.85 $81.90 - 2($4) + $253.85 $81.90 - $8 + $253.85 $73.90 + $253.85 $327.75
3. Where's the ball if it starts at the 50 yard line,
goes 10 yards to the black, 45 yards to the red,
12 yards to the red?
Scroll down to see computation. 0 + 10 - 45 - 12 10 - 45 - 12 - 35 - 12 - 47 or 47 yards from center or 3 yards from red goal line
4. What's the result of your trip to AC if you
take $20,
win $6,
loose $4,
win $10,
loose $3,
win $25,
win $4,
loose $30?
Scroll down to see computation. $20 + $6 - $4 + $10 - $3 + $25 + $4 - $30 $26 - $4 + $10 - $3 + $25 + $4 - $30 $22 + $10 - $3 + $25 + $4 - $30 $32 - $3 + $25 + $4 - $30 $29 + $25 + $4 - $30 $54 - $26 $28, win $28
© 2005, Agnes Azzolino
www.mathnstuff.com/math/algebra/introsn.htm