you do 21 divided by 7, which is obviously 3.
Find a common denominator. 21 is common. Multiply the fractions to achieve a common denominator of 21. 3/7 + 2/3 = 9/21 + 14/21 = 23/21
To find numbers that multiply to make -21, one number must be positive and the other must be negative. For example, 3 and -7 multiply together to give -21 (3 × -7 = -21). Other pairs include -3 and 7, or 1 and -21.
1 and 21 3 and 7
You can do 7 times 3 and that will equal 21
To find what you multiply to get 63, you can consider its factors. The pairs of numbers that multiply together to give 63 are 1 and 63, 3 and 21, and 7 and 9. For example, 7 multiplied by 9 equals 63.
Find a common denominator. 21 is common. Multiply the fractions to achieve a common denominator of 21. 3/7 + 2/3 = 9/21 + 14/21 = 23/21
7
Factor them. 2 x 5 = 10 3 x 7 = 21 No factors in common. Multiply them. 2 x 3 x 5 x 7 = 210
Multiply them together.
Multiply them together.
Multiply them together.
Multiply them together.
Multiply them together.
the greatest common factor is 7, because 21 divided by 7 is 3, 28 divided by 7 is 4 and 56 divided by 7 is 8.
Multiply them together. Multiply that total by successive counting numbers.
Multiply them together.
To find numbers that multiply to make -21, one number must be positive and the other must be negative. For example, 3 and -7 multiply together to give -21 (3 × -7 = -21). Other pairs include -3 and 7, or 1 and -21.