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A Valentine-themed cut-and-paste worksheet with eleven addition and subtraction problems within 20 on heart shapes (15-3, 11+6, 20-2, 9+4, 5+6, 17-3, 7+8, 15-5, 12-6, 4+8, 10+6). Students solve each problem and paste the correct answer from the bank below. Use for mixed-operation fluency practice.