Fill in the blanks to make the equations true.
A |
+ |
B |
+ |
C |
= |
+ |
D |
|
A |
+ |
B |
+ |
C |
= |
D |
+ |
|
A |
+ |
B |
+ |
C |
= |
We have
\blue{A}
blue dot
\blue{A}
blue dots and
\green{B}
green dot
\green{B}
green dots and
\purple{C}
purple dot
\purple{C}
purple dots.
We can arrange the dots to make them easier to count.
We have 10
dots in the top row. How many in the second row?
There is TOTAL - 10
dot in the second row, so
A + B + C = 10 + TOTAL - 10
.
There are TOTAL - 10
dots in the second row, so
A + B + C = 10 + TOTAL - 10
.
How many dots in total?
There are TOTAL
dots in total. So the missing numbers are
E
and TOTAL
.
Fill in the blanks to make the equations true.
TOTAL |
- |
A |
- |
B |
= |
- |
E |
|
TOTAL |
- |
A |
- |
B |
= |
10 |
- |
|
TOTAL |
- |
A |
- |
B |
= |
First arrange TOTAL
dots into rows of 10
.
We need to subtract A
and then subtract another B
,
so in total, we need to subtract A + B
.
First subtract enough dots to leave 10
remaining. How many have we subtracted?
We have subtracted TOTAL - 10
, so we need to subtract another [E, D][MISSING]
.
TOTAL - A - B = 10 - [E, D][MISSING]
.
After subtracting the remaining [E, D][MISSING]
, we have C
left.
TOTAL - A - B = C
.