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

How To Use
MrV’s Sums Table
For Addition
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Table Terminology
Adding Two 1-Digit Numbers
Adding a 1-Digit Number to a Longer Number
Handling Zeroes in Addition
Sums Table Terminology:
There are 9 table Rows,
Row 1 through Row 9
Each Cell holds 3
numbers:
The Sum (big number)
and its 2 Addends
For example,
this is Row 5:
5
Each Row has 10 Cells,
Cell 0 thru Cell 9.
For example,
this is Cell 6 in
Row 5.
Row, Cell, Addends, Sum
6
In this Cell, the
Sum is 11 and the
Addends are 5 + 6.
7 + 8=?
7+8
Adding Two 1-digit Numbers
1. Find the Row
for the first Addend
In this case,
it’s Row 7:
3. The big number
above them is
their Sum
15
2. Look across the
Row until you see
both Addends on
the bottom
In this case,
it’s 7 + 8
7 plus 8
is 15
Ok, let’s try a few:
Click when you find the Sum
7 7+99=
+
9 +9 4=
4
11
+
11
5 +5 6=
6
+
16
3 +3 88=
+
13
Two-step Adding
Most people know simple sums like: 3 + 4 = 7
and adding a digit to numbers that end in 0: 20 + 7 = 27
So 42 + 3 = 40 + 2 + 3 = 40 + 5 = 45 but, WHY?
You try:
26 + 3 = 20 + 9 = 29
7 + 61 = 60 + 8 = 68
Sometimes, there is a Carry:
34 + 7 = 30 + 11 = 41
You try:
79 + 5 = 70 + 14 = 84
6 + 38 = 30 + 14 = 44
8 + 22 = 20 + 10 = 30
95 + 8 = 90 + 13 = 103
25 + 9=?
Adding a 1-digit Number
to any 2-digit Number
5+9
1. Find the Row:
Use 1st Addend’s
units digit
3. Add the Addend’s
tens digit to the tens
digit of the Sum
In this case,
it’s Row 5:
(do in your head)
14
+2
2. Find the sum of the
Addend units digits
In this case,
it’s 5 + 9 = 14
=34
2 added to the
tens digit of 14
makes 34 the
Final Sum