+1 -1

Front

What is the result of adding 1 to a number ending in 999?

Back

The result is the next thousand. For example, 999 + 1 = 1000.

Front

What happens when you add 1 to a number like 19,999?

Back

You get 20,000, which is the next whole number.

Front

How do you subtract 1 from a number like 35,900?

Back

You simply decrease the last digit by 1, resulting in 35,899.

Front

What is the result of subtracting 1 from 15,000?

Back

The result is 14,999.

Front

What is the general rule for adding 1 to any number?

Back

Adding 1 to any number increases its value by one unit.

Front

What is the general rule for subtracting 1 from any number?

Back

Subtracting 1 from any number decreases its value by one unit.

Front

What is the significance of the number 100 in addition?

Back

100 is a milestone in counting, representing a complete set of ten tens.

Front

What is the significance of the number 1 in mathematics?

Back

1 is the identity element for addition, meaning any number plus 1 is the next number.

Front

How do you handle carrying in addition when the last digit is 9?

Back

You carry over to the next left digit, increasing it by 1.

Front

What is the result of adding 1 to 99?

Back

The result is 100.