Subtraction Shortcuts and Tips : Subtraction Shortcuts and Tips By Monica Yuskaitis
Subtracting Across Zeros : Subtracting Across Zeros 3 0 2
1 9 8
Step 1 – Borrow 1 from the 30 : Step 1 – Borrow 1 from the 30 3 0 2
1 9 8
Step 2 – Cross out the 30 : Step 2 – Cross out the 30 3 0 2
1 9 8
Step 3 – Write a 29 above the 30 : Step 3 – Write a 29 above the 30 3 0 2
1 9 8 2 9
Step 4 – Write a 1 in front of the 2 : Step 4 – Write a 1 in front of the 2 3 0 2
1 9 8 2 9 1
Step 5 – Subtract 8 from 12 : Step 5 – Subtract 8 from 12 3 0 2
1 9 8 2 9 1 4
Step 6 – Subtract 9 from 9 : Step 6 – Subtract 9 from 9 3 0 2
1 9 8 2 9 1 4 0
Step 7 – Subtract 1 from 2 : Step 7 – Subtract 1 from 2 3 0 2
1 9 8 2 9 1 4 0 1
We’re Finished : We’re Finished 3 0 2
1 9 8 2 9 1 4 0 1
Second Example : Second Example 8 0 0 2
3 7 6 5
Step 1 – Borrow 1 from 800 : Step 1 – Borrow 1 from 800 8 0 0 2
3 7 6 5
Step 2 – Cross out the 800 : Step 2 – Cross out the 800 8 0 0 2
3 7 6 5
Step 3 – Write 799 above the 800 : Step 3 – Write 799 above the 800 8 0 0 2
3 7 6 5 7 9 9
Step 4 – Write a 1 next to the 2 : Step 4 – Write a 1 next to the 2 8 0 0 2
3 7 6 5 7 9 9 1
Step 5 – Subtract 5 from the 12 : Step 5 – Subtract 5 from the 12 8 0 0 2
3 7 6 5 7 9 9 1 7
Step 6 – Subtract 6 from the 9 : Step 6 – Subtract 6 from the 9 8 0 0 2
3 7 6 5 7 9 9 1 7 3
Step 7 – Subtract 6 from the 9 : Step 7 – Subtract 6 from the 9 8 0 0 2
3 7 6 5 7 9 9 1 7 3 2
Step 7 – Subtract 3 from the 7 : Step 7 – Subtract 3 from the 7 8 0 0 2
3 7 6 5 7 9 9 1 7 3 2 4
We’re Finished : We’re Finished 8 0 0 2
3 7 6 5 7 9 9 1 7 3 2 4
It’s Your Turn : It’s Your Turn 7 0 0 5
2 8 3 6 6 9 9 1 9 6 1 4
It’s Your Turn Again : It’s Your Turn Again 9 0 0 4
7 9 5 6 8 9 9 1 8 4 0 1
Subtraction Tips : Subtraction Tips
Never subtract the top number from the bottom number : Never subtract the top number from the bottom number 4 6 6 6 1 3
2 7 9 Your answer will always be wrong.
Never borrow unless you need to : Never borrow unless you need to 9 6 2
8 4 1 1 5 Your answer will always be wrong.
Practice your subtraction facts : Practice your subtraction facts 18 – 9 =
18 – 7 =
16 – 8 =
14 – 8 =
12 – 9 =
11 – 3 =
15 – 7 =
9 – 3 =
18 – 5 =
18 – 3 =
16 – 7 =
14 – 6 =
12 – 4 =
11 – 7 =
15 – 6 =
9 – 5 =
9 11 8 6 3 8 8 6 13 15 9 8 8 4 9 4