Lesson 14 Subtracting Two-Digit and Three-Digit

1
Lesson 14 Subtracting Two-Digit and
Three-Digit Numbers / Missing Two-Digit Addends.

• Mental Math Add a number ending with two zeros
• to another number
• 300 400 b) 600 300 c) 250 300
• Review
• d) 63 29 e) 54 19 f) 28
  49

2
Rule of subtraction When subtracting two or
three digit numbers, always start with the ones
place and work left.

• 37
• 23
• 14

3
Your turn subtract 85 - 32 (write problem

horizontal)
We read this problem as eighty-five minus
thirty-two
Write the problem like this
85 - 32 53
We could also say, 32 is subtracted from 85
4
Your turn again Subtract 123 from 365.
(write problem horizontal)
(Hint start with 365 and subtract 123 from it.)
Problem looks like this

• 365
• 123
• 242

5
Missing two-digit addends
Find the missing addend one digit at a time.
56 __ 98
Six plus what number is eight? (2)
Five plus what number is nine? (4)
The missing digits are 4 and 2. Missing addend is
42.

56 42 98
6
Find the missing addend
M 17 49
Write problem horizontal M
17
49
Think what adds with 7 to make 9? (2)
what adds with 1 to make 4? (3)
Missing addend is 32.
32 17 49
7
Lesson practice do these problems on your
paper and show Ms. L before you start your
homework.

• Subtract 53 from 97. Write your problem
• 
  horizontal.
• Subtract twenty-three from fifty-four.
• Find the missing addend in each problem
• 24 d) M e) 36 W 99
• Q 31
• 65 67 f) Y 45
  99

Answers 44, 31, 41, 36, 63, 54