ข้อสอบGED MATHEMATICAL REASONING [Calculator] ชุดที่ 6
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#1. What is the geometric meaning of -5 < -2?
All statements are true, but in geometric terms, “<” means “is to the left of.”
#2. Albert has a bank balance of-65 dollars. George has a balance of -44 dollars. Zoe’s balance is -7 dollars; Pat’s balance is -82 dollars. Who owes more money to the bank?
They all have a debt equal to the absolute value of their balance.
#3. What is the greatest common factor of 42 and 36?
factors of 42: 1, 2,3, 6, 7, 14, 21, 42
factors of 36: 1, 2, 3, 4, 6 , 9, 12, 18, 36
common factors: 1,2,3,6
largest of these: 6
#4. What is the least common multiple of 6 and 9?
multiples of 6: 6, 12, 18 24, 30, 36, 42,48, . . .
multiples of 9:9, 18, 27, 36, 45,
common multiples: 18, 36,
smallest of these: 18
#5. Which situation describes quantities combining to make 0?
from the friend’s point of view,-85 5(17) = -85 85 = 0
#6. On a number line, where is the number -2 + (-7)?
Adding a negative is a move to the left on the number line.
#7. Which number line shows that a number and its opposite have a sum of 0?
Number opposite starts at zero, goes to the number, and then returns.
#8. Compute 3 – 7.
3-7=3 (-7)=-4
#9. Compute 5 – (-6).
5-(-6)=5 6=11
#10. Add 7 + (-5) + (-9).
7 (-5) (-9)=2 (-9)=-7
#11. Compute -3 – (-8) + (-4) – 5.
-3-(-8) (-4)-5=-3 8 (-4) (-5) = 5 (-4) (-5)= 1 (-5)=-4
#12. Add -9 + 3 + (-4).
-9 3 (-4)=-6 (-4)=-10
#13. Compute -8- (-10)- 5.
-8-(-10)-5=-8 10 (-5)= 2 (-5)=-3
#14. Multiply-7(-9).
The product of two numbers with identical signs is positive.
#15. Multiply 2(-4)(-1).
2(-4)(-1)= (-8)(-1)=8