Seek 50 primary school sixth grade mixed computing problems, the best can be simple, the best not to score, good must add points Oh, 50 questions

Seek 50 primary school sixth grade mixed computing problems, the best can be simple, the best not to score, good must add points Oh, 50 questions

1.3/7 × 49/9 - 4/3 2.8/9 × 15/36 + 1/27 3.12× 5/6 – 2/9 ×3 4.8× 5/4 + 1/4 5.6÷ 3/8 – 3/8 ÷6 6.4/7 × 5/9 + 3/7 × 5/9 7.5/2 -（ 3/2 + 4/5 ） 8.7/8 + （ 1/8 + 1/9 ） 9.9 × 5/6 + 5/6 10.3/4 ×...

There are four operations in grade four of primary school

When addition and subtraction and multiplication and division appear in the same formula at the same time, their operation order is multiplication and division first, and then addition and subtraction. If there are brackets, the operation order of the same level is from left to right. Such operation is called four arithmetic operation, and four arithmetic refers to the calculation rules of addition, subtraction, multiplication and division

What are the four operational laws in primary school?
In letters, I forgot

(fourth grade)
A + B = B + a additive commutative law
(a + b) + C = a + (B + C) Additive Association Law
A * b = b * a multiplicative exchange rate
(a * b) * C = a * (b * c) multiplicative associative law

Note that the formula calculation (off formula) 10 to it!
For example: 76 minus the product of 8 and 5, what's the difference?

A number divided by 30, quotient 15 more than 23, how much is this number? 210 times of a number is 6300, how much is this number? The sum of 66 and 121 divided by 11, what is the quotient? 456 and 76 in the difference, how many 38? 850 divided by 60 and 26, what is the quotient? 96 times 2, what is the quotient more than 96 divided by 2? 155 and 77 is 58