Number Chain Mixed Hard — Set 11

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                        "operand": 5
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                "answer": 2700,
                "question": "Number Chain: 5 → x5 → x4 → +8 → x5 → x5 → ?",
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                "subType": "number-chain",
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                        "operand": 2
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                "answer": 13,
                "question": "Number Chain: 1 → x2 → x2 → x2 → -2 → +7 → ?",
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            {
                "type": "number-chain",
                "subType": "number-chain",
                "start": 12,
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                        "op": "x",
                        "operand": 3
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                        "op": "x",
                        "operand": 5
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                    {
                        "op": "+",
                        "operand": 11
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                    {
                        "op": "-",
                        "operand": 154
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                    {
                        "op": "+",
                        "operand": 12
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                "answer": 49,
                "question": "Number Chain: 12 → x3 → x5 → +11 → -154 → +12 → ?",
                "difficulty": "hard"
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            {
                "type": "number-chain",
                "subType": "number-chain",
                "start": 4,
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                        "op": "x",
                        "operand": 2
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                        "operand": 7
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                        "op": "x",
                        "operand": 2
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                    {
                        "op": "-",
                        "operand": 1
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                    {
                        "op": "x",
                        "operand": 5
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                "answer": 5,
                "question": "Number Chain: 4 → x2 → -7 → x2 → -1 → x5 → ?",
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                        "op": "x",
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                        "operand": 6
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                    {
                        "op": "-",
                        "operand": 16
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                    {
                        "op": "+",
                        "operand": 12
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                ],
                "answer": 14,
                "question": "Number Chain: 1 → x3 → x4 → +6 → -16 → +12 → ?",
                "difficulty": "hard"
            },
            {
                "type": "number-chain",
                "subType": "number-chain",
                "start": 6,
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                        "op": "-",
                        "operand": 2
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                        "operand": 5
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                        "op": "+",
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                        "op": "x",
                        "operand": 2
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                    {
                        "op": "x",
                        "operand": 4
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                ],
                "answer": 232,
                "question": "Number Chain: 6 → -2 → x5 → +9 → x2 → x4 → ?",
                "difficulty": "hard"
            },
            {
                "type": "number-chain",
                "subType": "number-chain",
                "start": 5,
                "steps": [
                    {
                        "op": "+",
                        "operand": 9
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                    {
                        "op": "+",
                        "operand": 3
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                    {
                        "op": "x",
                        "operand": 5
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                    {
                        "op": "-",
                        "operand": 29
                    },
                    {
                        "op": "-",
                        "operand": 14
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                ],
                "answer": 42,
                "question": "Number Chain: 5 → +9 → +3 → x5 → -29 → -14 → ?",
                "difficulty": "hard"
            },
            {
                "type": "number-chain",
                "subType": "number-chain",
                "start": 9,
                "steps": [
                    {
                        "op": "x",
                        "operand": 2
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                        "op": "x",
                        "operand": 2
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                        "op": "x",
                        "operand": 2
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                    {
                        "op": "x",
                        "operand": 4
                    },
                    {
                        "op": "+",
                        "operand": 3
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                ],
                "answer": 291,
                "question": "Number Chain: 9 → x2 → x2 → x2 → x4 → +3 → ?",
                "difficulty": "hard"
            }
        ],
        "layout": {
            "columns": 2,
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