Answer: All powers of 4 are square numbers (since their square roots are always integer powers of 2). Any number with an integer square root is a square number. So 4, 16, 64, etc. are all square.
Answer: Actually, that will cover only some of the square numbers. To get all of them, get the multiples of (4 x any square number):
(4 x 1) x 4
(4 x 4) x 4
(4 x 9) x 4
(4 x 16) x 4
(4 x 25) x 4
etc.
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I can find 13 ways, not just 7, to make 60 from adding numbers in the 4, 5 and 9 times tables.
No, 86 is not in the 4 times tables. The 4 times tables consist of multiples of 4, starting from 4, 8, 12, 16, and so on. Since 86 is not a multiple of 4, it is not found in the 4 times tables.
The 4's times tables can be determined by taking 4 times all numbers, as high as you would like to go for the table size. For example 4x1=4, 4x2=8, 4x3=12, and so on until you get the desired amout of products for the table.
Because certain times tables always end in particular numbers. The numbers in the 10 times tables always end with a 0 e.g 10, 20, 30... The number in the 5 times tables always end with a 0 or 5 e.g. 5, 10, 15... The 2, 4, 6, 8 times tables will always end in even numbers. The 1 times table is obvious. The 9 times table always has digits that sum to 9 e.g. 9, 18, 27... The hardest times table is usually considered to be the 7 times table to learn as their is no obvious pattern to the numbers.
is 108 in the 4 tmes tables