Subtraction in Parts

Subtraction in Parts

LI:We are learning to subtract by splitting numbers into parts instead of counting down.

Exercise 1

Meera looked at 55 – 18 and said this is the same as 55 – 10 - 8 even though she did not work out the answer. How did she know?

She splitted 18 into 10 and 8.

For each of the following problems circle true or false.

1) 41 – 15 is the same as 41 – 10 – 5                   T F

2) 68 – 29 is the same as 68 – 20 – 8                    T F

3) 73 – 15 is the same as 73 – 5 – 20                   T F

4) 85 – 19 is the same as 85 – 11 – 8                    T F

5) 43 – 29 is the same as 43 – 20 – 3                     T F

6) 44 – 15 is the same as 44 – 5 – 10                     T F

7) 58 – 19 is the same as 58 -12 – 7                       T F

8) 36 – 17 is the same as 36 – 7 – 10                     T F

Exercise 2

For each of the following fill in the box or circle.

1) 55 – 18 = 55 – 10 - 8   

…

(2) 65 – 19 = 65 – 9 -  10

…

(3) 46 – 28 = 46 – 8 - 20

…

4) 41 – 12 = 41 - 6 - … 6

(5) 94 – 25 = 94 – 20 … - 5

(6) 62 – 28 = 62 - 20 - … 8

7) 36 – 17 = 36 – … 7- 10

(8) 52 – 25 = 52 - 20 - 5

…

(9) 63 – 36 = 63 – …  30 - 6

10) 73 – 15 = 73 – 10 - … 5

(11) 423 - 17 = 423 - … 10-7

(12) 306 – 27 = 306 - 20-7

This is my Maths work I did today.I got it some Maths equations wrong and then I checked them again and got it right.