Q3-4C - Buổi 32. Arithmetic and Number theory

Find the value of 40×125×88.

(a)  

Find the value of 217+789+183+512+211+188.

(a)  

Find the number that should be filled in the blank if the equation below is correct? (a)   x 7 : 4 + 9 = 30.

Find the value of 25×36×16×5×35÷12.

(a)  

Fill the lines with '×' and '−' to make the equation below correct. 7 ____ 2 ____ 5 ____ 3 = 67.

• 7 x 2 x 5 - 3 = 67

• 7 x 2 - 5 x 3 = 67

• 7 - 2 x 5 x 3 = 67

Find the value of 3+7+11+15+19+...+75+79+83.

(a)  

If a 10-digit number is divisible by 9, find the minimum value of A. 202221234A.

(a)  

How many factors does 1800 have?

(a)  

Define the operation symbol a ⊗ b = (a + b) × (2 × a + b − 5), find the value of 4 ⊗ (7 ⊗ 3).

(a)  

The sum of positive integers A and B is 645. A is 4 times of B. Find the value of A.

(a)