Section 1
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divisible by 8
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Last updated
6 years ago
Date created
Mar 14, 2020
Cards (86)
Section 1
(50 cards)
divisible by 8
if the number named by the last three digits is divisible by 8 Ex) 13802120 ---> 120/8 = 15
2⁷
128
2¹⁰
1024
(x²)³
= x²⋅³
(x/y)³
= (x³) / (y³)
2/5
.4 OR 40%
2³
8
3²
9
divisible by 9
if the sum of the digits is divisible by 9 Ex) 3483 ---> 3+4+8+3=18, 18 is divisible by 9
13/16
.8125 OR 81 1/4%
x^(p/r)
= x^(power/root)
x⁰
= 1 (x ≠ 0)
11/16
.6875 OR 68 3/4%
2/3
.6 OR 66 2/3%
1/3
.33 OR 33 1/3%
divisible by 11
if the difference between the sum of the even-place digits and the sum of the odd-place digits is a multiple of 11 Ex) 928,193,926 ---> odd sum (9+8+9+9+6=41) even sum (2+1+3+2=8) ---> 41-8=33, 33 is divisible by 11
1/8
.125 OR 12 1/2%
x^⁻³
= 1 / x³
1/6
.16 OR 16 2/3%
1/2
.5 OR 50%
3/5
.6 OR 60%
2⁵
32
multiplying decimals
count the number of decimal places and add them Ex) 45.67 x .987 (5 places) = 45.07629 (5 places)
5/8
.625 OR 62 1/2%
divisible by 4
if the number named by the last 2 digits is divisible by 4 Ex) 3936 is divisible by 4 because 36 is divisible by 4
dividing decimals
move the decimal point in the divisor and the dividend the same number of places to get whole numbers Ex) 23.1 / .004 ----> 23.1 x 1000 / .004 x 1000 ----> 23100/4 ---> 5775
2²
4
1/16
.0625 OR 6 1/4%
(xy)³
= (x³)(y³)
3/16
.1875 OR 18 3/4%
7/8
.875 OR 87 1/2%
4/5
.8 OR 80%
2⁴
16
2⁶
64
9/16
.5625 OR 56 1/4%
1 / x^-m
= x^m
3/8
.375 OR 37 1/2%
(x³) / (x²)
= x³⁻² OR 1 / x²⁻³
(x²)(x³)
= x²⁺³
15/16
93 3/4%
1/5
.2 OR 20%
7/16
.4375 OR 43 3/4%
5/16
.3125 OR 31 1/4%
divisible by 6
if rules for 2 and 3 check out ---- 1) the number is even & 2) the sum of the digits is divisible by 3
2⁸
256
divisible by 3
if the sum of the digits is divisible by 3 Ex) 456 ---> 4+5+6=15, 15 is divisible by 3
1/4
.25 OR 25%
3/4
.75 OR 75%
2⁹
512
5/6
.83 OR 83 1/3%
Section 2
(36 cards)