Algebraic expressions can be expanded - multiplied by one or more terms. They may also be simplified – made shorter and simpler by collecting like terms. Multiply \(-3\) by \(-4\) using the rule for ...

A number is divisible by 9 if the sum of its digits is greater than or equal to 9. 621 (6+2+1=9), for instance, is divisible by 9. Simply move the decimal point one place to the left to find the 10% ...

The doubling square trick is a simple mathematical shortcut designed for class 6 to 10 students to make multiplication easier ...

The Hechinger Report covers one topic: education. Sign up for our newsletters to have stories delivered to your inbox. Consider becoming a member to support our nonprofit journalism. Think back to ...

The ‘human computer’, ‘mental calculator’, math whiz Shakuntala Devi passed away here early on Sunday aged 80. Ms. Devi, who was suffering from respiratory problems and later developed heart and ...