Grade 1 Mixed Operations Missing Number — Set 35

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        "operation": "mixed",
        "subject": "arithmetic",
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            "operations": [
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                "-",
                "×",
                "÷"
            ],
            "missingOperand": true,
            "maxSum": 20,
            "maxOperand": 120,
            "_gradeLevel": "1"
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        "problems": [
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                "operand1": 12,
                "operator": "+",
                "operand2": 7,
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                "answer": 19,
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                "operator": "-",
                "operand2": 18,
                "question": "20 - 18 = ___",
                "answer": 2,
                "visualIntent": {
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            {
                "id": 5,
                "operand1": 2,
                "operator": "+",
                "operand2": 15,
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                "answer": 17,
                "visualIntent": {
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                    "label": "17"
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            },
            {
                "id": 6,
                "operand1": 10,
                "operator": "-",
                "operand2": 2,
                "question": "10 - 2 = ___",
                "answer": 8,
                "visualIntent": {
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                "id": 9,
                "operand1": 11,
                "operator": "+",
                "operand2": 8,
                "question": "11 + 8 = ___",
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                "visualIntent": {
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                "id": 10,
                "operand1": 19,
                "operator": "-",
                "operand2": 4,
                "question": "19 - 4 = ___",
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                "visualIntent": {
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                "id": 12,
                "operand1": 4,
                "operator": "+",
                "operand2": 7,
                "question": "4 + 7 = ___",
                "answer": 11,
                "visualIntent": {
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                "id": 13,
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                "operand2": 4,
                "question": "12 - 4 = ___",
                "answer": 8,
                "visualIntent": {
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                    "label": "8"
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                "id": 16,
                "operand1": 13,
                "operator": "+",
                "operand2": 2,
                "question": "13 + 2 = ___",
                "answer": 15,
                "visualIntent": {
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                    "label": "15"
                }
            },
            {
                "id": 17,
                "operand1": 2,
                "operator": "-",
                "operand2": 1,
                "question": "2 - 1 = ___",
                "answer": 1,
                "visualIntent": {
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                    "label": "1"
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            },
            {
                "id": 20,
                "operand1": 3,
                "operator": "+",
                "operand2": 12,
                "question": "3 + 12 = ___",
                "answer": 15,
                "visualIntent": {
                    "layout": "icon-badge",
                    "category": "fruits",
                    "label": "15"
                }
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        ],
        "layout": {
            "columns": 2,
            "problemsPerPage": 20
        }
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    "outputTargets": {
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    "_archetype": "form-exercise",
    "_generatorId": "arithmetic-generator-v7.2.1"
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