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?

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