B Set 21 Unknown

This page uses a content type that does not have a custom renderer yet. Raw structured data is shown below.

{
    "contentData": {
        "operation": "number-bonds",
        "subject": "arithmetic",
        "difficulty": "medium",
        "config": {
            "difficulty": "medium",
            "targetMin": 2,
            "targetMax": 10,
            "operation": "multiplication",
            "maxNumber": 10
        },
        "problems": [
            {
                "id": 1,
                "type": "number-bonds",
                "subType": "number-bonds",
                "total": 10,
                "knownPart": 6,
                "missingPart": 4,
                "question": "10 = __ + 6",
                "answer": 4,
                "correctAnswer": "4",
                "difficulty": "medium"
            },
            {
                "id": 2,
                "type": "number-bonds",
                "subType": "number-bonds",
                "total": 5,
                "knownPart": 1,
                "missingPart": 4,
                "question": "5 = 1 + __",
                "answer": 4,
                "correctAnswer": "4",
                "difficulty": "medium"
            },
            {
                "id": 4,
                "type": "number-bonds",
                "subType": "number-bonds",
                "total": 8,
                "knownPart": 1,
                "missingPart": 7,
                "question": "Number bond: 8 = ? + 1",
                "answer": 7,
                "correctAnswer": "7",
                "difficulty": "medium"
            },
            {
                "id": 5,
                "type": "number-bonds",
                "subType": "number-bonds",
                "total": 6,
                "knownPart": 4,
                "missingPart": 2,
                "question": "Number bond: 6 = ? + 4",
                "answer": 2,
                "correctAnswer": "2",
                "difficulty": "medium"
            },
            {
                "id": 6,
                "type": "number-bonds",
                "subType": "number-bonds",
                "total": 9,
                "knownPart": 3,
                "missingPart": 6,
                "question": "Number bond: 9 = 3 + ?",
                "answer": 6,
                "correctAnswer": "6",
                "difficulty": "medium"
            },
            {
                "id": 7,
                "type": "number-bonds",
                "subType": "number-bonds",
                "total": 8,
                "knownPart": 4,
                "missingPart": 4,
                "question": "8 = __ + 4",
                "answer": 4,
                "correctAnswer": "4",
                "difficulty": "medium"
            },
            {
                "id": 8,
                "type": "number-bonds",
                "subType": "number-bonds",
                "total": 5,
                "knownPart": 1,
                "missingPart": 4,
                "question": "Number bond: 5 = ? + 1",
                "answer": 4,
                "correctAnswer": "4",
                "difficulty": "medium"
            }
        ],
        "layout": {
            "columns": 2,
            "problemsPerPage": 20
        }
    },
    "outputTargets": {
        "screen": true,
        "print": true,
        "pdf": true,
        "answerKey": true
    },
    "_archetype": "form-exercise",
    "_generatorId": "arithmetic-generator-v7.2.1"
}