7th Grade Math 7-12

INTEGER MAYHEM

100

Evaluate the expression. −18 − (−43) − 29

−4. −18 + 43 − 29 = −4.

200

Evaluate the expression. −47 − 28 − (−65)

−10. −47 − 28 + 65 = −10.

300

Evaluate the expression. −36 − (−52) − 41 − (−19)

−6. −36 + 52 − 41 + 19 = −6.

400

Evaluate the expression. −84 − [−37 − (−62)] − (−18)

−91. Brackets = 25, so −84 − 25 + 18 = −91.

500

Evaluate the expression. −125 − [−48 − (−73)] − [−36 − (−59)]

−173. First bracket = 25; second bracket = 23. −125 − 25 − 23 = −173.

SIGN SWITCH

100

Rewrite −24 − (−39) as an addition expression. Then evaluate.

−24 + 39 = 15.

200

Rewrite −17 − 28 − (−46) using addition only. Evaluate.

−17 + (−28) + 46 = 1.

300

Write an equivalent addition expression for −35 − (−18) − 27. Then find the sum.

−35 + 18 + (−27) = −44.

400

Write −42 − (−67) as an unknown addend equation. Find the unknown addend.

−67 + x = −42. x = 25.

500

Consider −58 − (−93). Write an equivalent addition expression and an unknown addend equation. Evaluate and check your work.

−58 + 93 = 35. Unknown addend equation: −93 + x = −58, so x = 35.

FRACTION FRENZY

100

Evaluate the expression. −7/8 − (−3/4)

−1/8. −7/8 + 6/8 = −1/8.

200

Evaluate the expression. 5/6 − (−7/9)

29/18 or 1 11/18.

300

Evaluate the expression. −2 3/4 − (−1 5/6)

−11/12. −33/12 + 22/12 = −11/12.

400

Evaluate the expression. 3 5/8 − (−2 7/12) − 4 1/6

2 1/24. Using denominator 24: 87/24 + 62/24 − 100/24 = 49/24.

500

Evaluate the expression. −4 2/3 − [1 5/6 − (−2 3/4)]

−9 1/4. Brackets = 4 7/12. Then −4 2/3 − 4 7/12 = −9 1/4.

DECIMAL DANGER

100

Evaluate the expression. −3.75 − (−1.8) − 2.65

^−4.6.

200

Evaluate the expression. 12.04 − (−8.76) − 25.9

−5.1.

300

Evaluate the expression. −6.45 − 3.875 − (−8.2)

−2.125.

400

Evaluate the expression. −0.125 − [2.75 − (−1.375)] + 0.6

−3.65. Brackets = 4.125; −0.125 − 4.125 + 0.6 = −3.65.

500

Evaluate the expression. −12.75 − [−4.625 − (−9.375)] − (−6.8)

−10.7. Brackets = 4.75; −12.75 − 4.75 + 6.8 = −10.7.

MATH MADNESS

100

Evaluate the expression. −3/4 − (−1.25)

1/2 or 0.5.

200

Evaluate the expression. −2 1/2 − (−3/4) − 1.25

−3.

300

Evaluate the expression. −4.5 − (−2 3/4) − 1/2

−2.25 or −2 1/4.

400

Evaluate the expression. −3 1/8 − [1.75 − (−2 3/8)]

−7 1/4. Brackets = 4 1/8. −3 1/8 − 4 1/8 = −7 1/4.

500

Evaluate the expression. −5 2/3 − [−1.75 − (−3 1/4)] − (−2 5/6)

_{−4 1/3. Brackets = 1 1/2. Then −5 2/3 − 1 1/2 + 2 5/6 = −4 1/3.}