Addition and subtraction including Decimal and Negative numbers

Addition decimal number

100

What decimal number is represented by 70+8+0.3+0.01?

78,31

200

Estimate then calculate.

a. 28.2+13.4= 

b. 12.46+1.31=

a. 41,6

b. 13.77

300

Join pairs of numbers that total of 10. Say the numbers in English.

            3.7                         5.8                        7.6 

2.4           3.4             4.2            5.4             6.3             7.3

a. 3.7+6.3=10

b. 5.8+4.2=10

c. 7.6+2.4=10

400

Here are four-digit cards. 

8   4   2   5

Use each card once to complete the calculation.

0.___+0.___=1

0.48+0.52=1

500

Use all the numbers:

0.1 0.2 0.3 0.5 0.7 0.8 0.9 to make the total of each line 1.5.

1. 0.1+0.9=1

2. 0.2+0.8=1

3. 0.3+0.7=1

in the middle circle 0.5

Subtraction decimal number

100

Estimate then calculate.

123.1-47.3=

75,8

200

What is the difference between 54.31 and 46.76?

7.55

300

Fatima has $7.25. She is given $15.50.

How much does she have now?

-8,25

400

in a sale, a shop takes $2.25 off the price of these books.

$6.65      $16.35        $15.50    $8.70

a. What is the cost of each book in the sale?

b. What is the total cost of the four books in the sale?

a) Sale prices:
A $4.40
B $14.10
C $13.25
D $6.45

b) Total cost = $38.20

500

In a sale, a shop takes $2.25 off the price of these books.

$6.65      $16.35        $15.50    $8.70

a. What is the cost of each book in the sale?

b. What is the total cost of the four books in the sale?

a) Sale prices:
A $4.40
B $14.10
C $13.25
D $6.45

b) Total cost = $38.20

Addition Negative number

100

Calculate.

-4+2=

-2

200

What is four more than -three?

1

300

Calculate.

-4+2=

-2

400

The night-time on temperature on Saturday was 4 ⁰C warmer than the temperature on Friday night.

Friday night temperature was -6.

What was the night-time temperature on Friday?

 The temperature on Friday night was -2.

500

1. The temperature now is -4 ⁰C. The rise of 2 degrees.

2. The temperature now is -3 ⁰C. The rise of 8 degrees.

Find the new temperature.

1. -2 degrees.

2.  5 degrees.

Subtraction Negative number

100

What is five less than two?

-3.

200

Calculate.

-65-35=

-100.

300

What is -30 less than 1?

-31.

400

On a different day the temperature in London is 4 ⁰C.

Montreal is 16 ⁰C colder than in London.

What is the temperature in Montreal?

The temperature in Montreal is −12°C.

500

1. The temperature now is -2 ⁰C. The fall of 5 degrees.

2. The temperature now is 6 ⁰C. The rise of 6 degrees.

Find the new temperature.

1. -7.

2. 0