Ahmed found the volume of a cone having both a height and a diameter of 6 centimeters. His work is shown below.
Step 1
Find the radius.
6
radius = z = 3 cm
Step 2
Step 3
Find the area of the base.
Area of base = x(3)2 - 9 x cm
Multiply the area of the base by the height.
9xx 6 = 54 cm
Divide 54 by 3 to find the volume of the cone.
Volume of the cone =
54 - 18cm
Step 4
54
What was Ahmed's first error?
In Step 1, the radius should be found by multiplying the diameter by 2.
In Step 2, the formula 2 ar should be used to find the area of the circle.

Here's the 8's times tables:
8x1=8
8x2=16
8x3=24
8x4=32
8x5=40
8x6=48
8x7=56
8x8=64
8x9=72
8x10=80
8x11=88
8x12=96
Okay, so here's a few tricks I've learned in elementary school.
For ones, whatever you multiply by one is itself.
For twos, just count on 8 fingers by 2
For fives, just count on 8 fingers by 5
For nines, you hold up all ten of your fingers in front of you and, for example, if a question was 9x3, then on your left hand you'd put down your middle finger( the third finger) and you see two fingers and then there's a space, and there's seven fingers on the other side of the space. The answer is 27! Ta-da
All times tables are is just pure memorization. Hope I helped a LOT!