Transcript Using MrV’s Times Table - Mt. San Jacinto College

How To Use
MrV’s Sums Table
- For Subtraction
Terminology Review:
17 – 9 = 8
Minuend – Subtrahend = Difference
Using the Sums Table for Subtraction:
For Addition:
Each Cell holds 3
numbers:
The Sum (big number)
and its 2 Addends
In this Cell, the
Sum is 14 and the
Addends are 8 + 6.
For Subtraction:
Each Cell holds 3
numbers:
- The Minuend is the
big number.
- The little numbers
are the Subtrahend
and Difference
Min – Sub = Diff
This Cell defines two
different subtractions:
14 – 8 = 6
and
14 – 6 = 8
Let’s Look at One Cell
Borrowing:
Have you noticed that
Borrowing always results in a
number from 10 to 18?
2 15
4 10
6 18
0 13 9 9 16 12
3/ 5/
 7
5/ 0/
2
7/ 8/
 9
1/ 4/ 0/ , 0/ 7/ 2/
 5 6, 9 7 5
28
48
69
If you are unclear on these
subtractions, you can use the
table to find them quickly:
- For 15 – 7 use the 7th row
to look for a big 15
- The second addend 8 is
the difference
- So: 15 – 7 = 8
8 3, 0 9 7
You can also look along the
diagonal of “teen” minuends
to find the subtrahend.
The other addend is always
the difference.
Try 15 – 9 …
There are two places to find the
answer, the 6th row or 9th row
So: 15 – 9 = 6
15 – 7=?
15
Subtracting a 1-digit Number
1. Find the Row
that matches the
Subtrahend
In this case,
it’s Row 7:
3. The 2nd addend
below it is the
difference
15 minus 7
is 8
2. Look across the
Row until you see
the Minuend
(It’s the big number)
In this case,
it’s 15
8
Ok, let’s try a few:
Click when you find the Sum
14 – 8 =
14
10 – 4 =
10
6
17 – 9 =
17
7
13 – 6 =
13
6
8