Number Chain Patterns Hard — Set 24

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                "subType": "number-chain",
                "start": 12,
                "steps": [
                    {
                        "op": "x",
                        "operand": 4
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                    {
                        "op": "-",
                        "operand": 33
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                    {
                        "op": "-",
                        "operand": 13
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                    {
                        "op": "-",
                        "operand": 1
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                    {
                        "op": "x",
                        "operand": 3
                    }
                ],
                "answer": 3,
                "question": "Number Chain: 12 → x4 → -33 → -13 → -1 → x3 → ?",
                "difficulty": "hard"
            },
            {
                "type": "number-chain",
                "subType": "number-chain",
                "start": 12,
                "steps": [
                    {
                        "op": "x",
                        "operand": 3
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                    {
                        "op": "-",
                        "operand": 25
                    },
                    {
                        "op": "+",
                        "operand": 9
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                    {
                        "op": "+",
                        "operand": 11
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                    {
                        "op": "+",
                        "operand": 8
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                ],
                "answer": 39,
                "question": "Number Chain: 12 → x3 → -25 → +9 → +11 → +8 → ?",
                "difficulty": "hard"
            },
            {
                "type": "number-chain",
                "subType": "number-chain",
                "start": 6,
                "steps": [
                    {
                        "op": "-",
                        "operand": 5
                    },
                    {
                        "op": "-",
                        "operand": 1
                    },
                    {
                        "op": "x",
                        "operand": 2
                    },
                    {
                        "op": "+",
                        "operand": 9
                    },
                    {
                        "op": "-",
                        "operand": 6
                    }
                ],
                "answer": 3,
                "question": "Number Chain: 6 → -5 → -1 → x2 → +9 → -6 → ?",
                "difficulty": "hard"
            },
            {
                "type": "number-chain",
                "subType": "number-chain",
                "start": 11,
                "steps": [
                    {
                        "op": "x",
                        "operand": 3
                    },
                    {
                        "op": "x",
                        "operand": 2
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                    {
                        "op": "-",
                        "operand": 41
                    },
                    {
                        "op": "x",
                        "operand": 2
                    },
                    {
                        "op": "x",
                        "operand": 4
                    }
                ],
                "answer": 200,
                "question": "Number Chain: 11 → x3 → x2 → -41 → x2 → x4 → ?",
                "difficulty": "hard"
            },
            {
                "type": "number-chain",
                "subType": "number-chain",
                "start": 8,
                "steps": [
                    {
                        "op": "-",
                        "operand": 4
                    },
                    {
                        "op": "-",
                        "operand": 2
                    },
                    {
                        "op": "+",
                        "operand": 10
                    },
                    {
                        "op": "+",
                        "operand": 8
                    },
                    {
                        "op": "+",
                        "operand": 4
                    }
                ],
                "answer": 24,
                "question": "Number Chain: 8 → -4 → -2 → +10 → +8 → +4 → ?",
                "difficulty": "hard"
            },
            {
                "type": "number-chain",
                "subType": "number-chain",
                "start": 7,
                "steps": [
                    {
                        "op": "x",
                        "operand": 5
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                    {
                        "op": "+",
                        "operand": 8
                    },
                    {
                        "op": "+",
                        "operand": 11
                    },
                    {
                        "op": "+",
                        "operand": 4
                    },
                    {
                        "op": "x",
                        "operand": 5
                    }
                ],
                "answer": 290,
                "question": "Number Chain: 7 → x5 → +8 → +11 → +4 → x5 → ?",
                "difficulty": "hard"
            },
            {
                "type": "number-chain",
                "subType": "number-chain",
                "start": 9,
                "steps": [
                    {
                        "op": "x",
                        "operand": 2
                    },
                    {
                        "op": "+",
                        "operand": 12
                    },
                    {
                        "op": "x",
                        "operand": 3
                    },
                    {
                        "op": "+",
                        "operand": 11
                    },
                    {
                        "op": "x",
                        "operand": 4
                    }
                ],
                "answer": 404,
                "question": "Number Chain: 9 → x2 → +12 → x3 → +11 → x4 → ?",
                "difficulty": "hard"
            },
            {
                "type": "number-chain",
                "subType": "number-chain",
                "start": 11,
                "steps": [
                    {
                        "op": "+",
                        "operand": 6
                    },
                    {
                        "op": "-",
                        "operand": 8
                    },
                    {
                        "op": "x",
                        "operand": 3
                    },
                    {
                        "op": "+",
                        "operand": 4
                    },
                    {
                        "op": "x",
                        "operand": 4
                    }
                ],
                "answer": 124,
                "question": "Number Chain: 11 → +6 → -8 → x3 → +4 → x4 → ?",
                "difficulty": "hard"
            }
        ],
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    "_archetype": "form-exercise",
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