Math worksheet with algebraic expressions and a color-coded answer key.

Final Answer:
A1 → 6 + 8 = 14 → Blue
A2 → 7 − 3 = 4 → Yellow
A3 → 9 − 2 = 7 → Green
A4 → 5 + 4 = 9 → Red
B1 → 10 − 6 = 4 → Yellow
B2 → 8 + 5 = 13 → Blue
B3 → 12 − 7 = 5 → Light Blue
B4 → 3 + 9 = 12 → Dark Blue
C1 → 15 − 8 = 7 → Green
C2 → 6 + 7 = 13 → Blue
C3 → 11 − 4 = 7 → Green
C4 → 2 + 9 = 11 → Dark Blue
D1 → 14 − 5 = 9 → Red
D2 → 8 + 6 = 14 → Blue
D3 → 10 − 3 = 7 → Green
D4 → 4 + 7 = 11 → Dark Blue
E1 → 16 − 9 = 7 → Green
E2 → 5 + 8 = 13 → Blue
E3 → 12 − 5 = 7 → Green
E4 → 3 + 10 = 13 → Blue
F1 → 18 − 10 = 8 → Orange
F2 → 7 + 6 = 13 → Blue
F3 → 14 − 6 = 8 → Orange
F4 → 9 + 4 = 13 → Blue
G1 → 20 − 12 = 8 → Orange
G2 → 11 + 2 = 13 → Blue
G3 → 17 − 9 = 8 → Orange
G4 → 5 + 8 = 13 → Blue
H1 → 19 − 11 = 8 → Orange
H2 → 6 + 7 = 13 → Blue
H3 → 15 − 7 = 8 → Orange
H4 → 4 + 9 = 13 → Blue

Color key applied:
- 14 → Blue
- 4 → Yellow
- 7 → Green
- 9 → Red
- 13 → Blue
- 5 → Light Blue
- 12 → Dark Blue
- 11 → Dark Blue
- 8 → Orange

So the final colored squares (by letter) are:
A1: Blue, A2: Yellow, A3: Green, A4: Red
B1: Yellow, B2: Blue, B3: Light Blue, B4: Dark Blue
C1: Green, C2: Blue, C3: Green, C4: Dark Blue
D1: Red, D2: Blue, D3: Green, D4: Dark Blue
E1: Green, E2: Blue, E3: Green, E4: Blue
F1: Orange, F2: Blue, F3: Orange, F4: Blue
G1: Orange, G2: Blue, G3: Orange, G4: Blue
H1: Orange, H2: Blue, H3: Orange, H4: Blue