Numbers

Question 1

How do you add negative numbers?

Answer 1

By adding their absolute values and applying the negative sign when necessary.

For example: -0.8 + 1.3 = 0.8

Question 2

What is the result of -0.8 + 1.3?

Answer 2

0.5

It illustrates the addition of a negative and a positive number.

Question 3

What is the result of -6 - 9.4?

Answer 3

-15.4

This shows how to add two negative numbers.

Question 4

What is the result of 6 + 9.4?

Answer 4

15.4

This shows how to add two positive numbers.

Question 5

How do you multiply and divide negative numbers?

Answer 5

Ignore the signs during calculation, and apply the sign rules afterwards.

A negative number divided by a negative number gives a positive answer.

Question 6

What is the result of -16.8 ÷ -4?

Answer 6

4.2

This demonstrates dividing two negative numbers.

Question 7

What is the result of 4.3 × -5?

Answer 7

-21.5

This shows multiplying a positive number by a negative number.

Question 8

How do you estimate square roots?

Answer 8

Identify the perfect squares closest to the number and determine the range.

For example, √39 lies between √36 and √49.

Question 9

Estimate √39 to 1 decimal place.

Answer 9

6.2

This estimation is based on the proximity to perfect squares.

Question 10

Estimate √60 to 1 decimal place.

Answer 10

3.9

This estimation is based on the proximity to perfect squares.

Question 11

How do you multiply whole numbers and decimals by 10 to the power of any integer?

Answer 11

Shift the decimal point to the right or left based on the exponent.

For example: 2.1 × 10^3 = 2100.

Question 12

What is the result of 350 ÷ 10^2?

Answer 12

3.5

This demonstrates dividing by a power of ten.

Question 13

What is the result of 7100 × 10^-4?

Answer 13

0.71

This shows how to multiply by a negative power of ten.

Question 14

What is the result of 0.16 ÷ 10^-5?

Answer 14

16000

This demonstrates division by a negative power of ten.

Question 15

What is the result of -23.8 ÷ 7?

Answer 15

-3.4

This shows the division of a negative number by a positive number.

Question 16

What is the result of 5.1 × 3?

Answer 16

15.3

This shows multiplication of two positive numbers.

Question 17

What is the result of -25.8 ÷ 6?

Answer 17

-4.3

This shows division of a negative number by a positive number.

Question 18

What is the result of -2.7 × 4?

Answer 18

-10.8

This shows multiplication of a negative number by a positive number.

Question 19

Estimate √20 to 1 decimal place.

Answer 19

4.5

This is an estimation based on the nearest perfect squares.

Question 20

Estimate √80 to 1 decimal place.

Answer 20

8.9

This is an estimation based on the nearest perfect squares.

Question 21

What is the result of 2.3 × 10^3?

Answer 21

2300

This shows multiplication by a power of ten.

Question 22

What is the result of 2100 ÷ 10^2?

Answer 22

21

This demonstrates division by a power of ten.

Question 23

What is the result of 0.00047 × 10^5?

Answer 23

47

This shows multiplication by a power of ten.

Question 24

What is the result of 19200000 ÷ 10^6?

Answer 24

19.2

This demonstrates division by a power of ten.

Question 25

What is the result of 340000 × 10^-4?

Answer 25

34 ## Footnote This shows multiplication by a negative power of ten.

Question 26

What is the result of 0.00036 ÷ 10^-5?

Answer 26

36000 ## Footnote This demonstrates division by a negative power of ten.

Question 27

What is the result of 290000 × 10^-3?

Answer 27

290 ## Footnote This shows multiplication by a negative power of ten.

Question 28

What is the result of 0.041 ÷ 10^-2?

Answer 28

4.1 ## Footnote This demonstrates division by a negative power of ten.