hard Set 99 Form Exercise

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    "operation": "math-match",
    "subject": "arithmetic",
    "difficulty": "hard",
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    "problems": [
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            "type": "math-match",
            "subType": "math-match",
            "pairs": [
                {
                    "expr": "14+13",
                    "value": 27
                },
                {
                    "expr": "16+19",
                    "value": 35
                },
                {
                    "expr": "4x3",
                    "value": 12
                },
                {
                    "expr": "11-1",
                    "value": 10
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                {
                    "expr": "7-4",
                    "value": 3
                },
                {
                    "expr": "8-7",
                    "value": 1
                },
                {
                    "expr": "4x8",
                    "value": 32
                }
            ],
            "answer": "14+13=27; 16+19=35; 4x3=12; 11-1=10; 7-4=3; 8-7=1; 4x8=32",
            "question": "Match each expression with its answer: 14+13=?, 16+19=?, 4x3=?, 11-1=?, 7-4=?, 8-7=?, 4x8=?",
            "difficulty": "hard"
        },
        {
            "type": "math-match",
            "subType": "math-match",
            "pairs": [
                {
                    "expr": "13+3",
                    "value": 16
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                {
                    "expr": "12-9",
                    "value": 3
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                {
                    "expr": "9x7",
                    "value": 63
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                {
                    "expr": "15-15",
                    "value": 0
                },
                {
                    "expr": "6x8",
                    "value": 48
                },
                {
                    "expr": "5+13",
                    "value": 18
                },
                {
                    "expr": "10+2",
                    "value": 12
                }
            ],
            "answer": "13+3=16; 12-9=3; 9x7=63; 15-15=0; 6x8=48; 5+13=18; 10+2=12",
            "question": "Match each expression with its answer: 13+3=?, 12-9=?, 9x7=?, 15-15=?, 6x8=?, 5+13=?, 10+2=?",
            "difficulty": "hard"
        },
        {
            "type": "math-match",
            "subType": "math-match",
            "pairs": [
                {
                    "expr": "1+3",
                    "value": 4
                },
                {
                    "expr": "9x4",
                    "value": 36
                },
                {
                    "expr": "2x4",
                    "value": 8
                },
                {
                    "expr": "11-11",
                    "value": 0
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                {
                    "expr": "20-11",
                    "value": 9
                },
                {
                    "expr": "10+11",
                    "value": 21
                },
                {
                    "expr": "6-3",
                    "value": 3
                }
            ],
            "answer": "1+3=4; 9x4=36; 2x4=8; 11-11=0; 20-11=9; 10+11=21; 6-3=3",
            "question": "Match each expression with its answer: 1+3=?, 9x4=?, 2x4=?, 11-11=?, 20-11=?, 10+11=?, 6-3=?",
            "difficulty": "hard"
        },
        {
            "type": "math-match",
            "subType": "math-match",
            "pairs": [
                {
                    "expr": "7+3",
                    "value": 10
                },
                {
                    "expr": "18+8",
                    "value": 26
                },
                {
                    "expr": "13+15",
                    "value": 28
                },
                {
                    "expr": "6-4",
                    "value": 2
                },
                {
                    "expr": "19+2",
                    "value": 21
                },
                {
                    "expr": "13+3",
                    "value": 16
                },
                {
                    "expr": "16-13",
                    "value": 3
                }
            ],
            "answer": "7+3=10; 18+8=26; 13+15=28; 6-4=2; 19+2=21; 13+3=16; 16-13=3",
            "question": "Match each expression with its answer: 7+3=?, 18+8=?, 13+15=?, 6-4=?, 19+2=?, 13+3=?, 16-13=?",
            "difficulty": "hard"
        },
        {
            "type": "math-match",
            "subType": "math-match",
            "pairs": [
                {
                    "expr": "2x9",
                    "value": 18
                },
                {
                    "expr": "10+4",
                    "value": 14
                },
                {
                    "expr": "3x3",
                    "value": 9
                },
                {
                    "expr": "13+17",
                    "value": 30
                },
                {
                    "expr": "2x2",
                    "value": 4
                },
                {
                    "expr": "6+11",
                    "value": 17
                },
                {
                    "expr": "4x4",
                    "value": 16
                }
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            "answer": "2x9=18; 10+4=14; 3x3=9; 13+17=30; 2x2=4; 6+11=17; 4x4=16",
            "question": "Match each expression with its answer: 2x9=?, 10+4=?, 3x3=?, 13+17=?, 2x2=?, 6+11=?, 4x4=?",
            "difficulty": "hard"
        },
        {
            "type": "math-match",
            "subType": "math-match",
            "pairs": [
                {
                    "expr": "4+7",
                    "value": 11
                },
                {
                    "expr": "19-3",
                    "value": 16
                },
                {
                    "expr": "2-2",
                    "value": 0
                },
                {
                    "expr": "18+3",
                    "value": 21
                },
                {
                    "expr": "8x7",
                    "value": 56
                },
                {
                    "expr": "18-5",
                    "value": 13
                },
                {
                    "expr": "3-1",
                    "value": 2
                }
            ],
            "answer": "4+7=11; 19-3=16; 2-2=0; 18+3=21; 8x7=56; 18-5=13; 3-1=2",
            "question": "Match each expression with its answer: 4+7=?, 19-3=?, 2-2=?, 18+3=?, 8x7=?, 18-5=?, 3-1=?",
            "difficulty": "hard"
        },
        {
            "type": "math-match",
            "subType": "math-match",
            "pairs": [
                {
                    "expr": "11-8",
                    "value": 3
                },
                {
                    "expr": "15+19",
                    "value": 34
                },
                {
                    "expr": "3x5",
                    "value": 15
                },
                {
                    "expr": "12-6",
                    "value": 6
                },
                {
                    "expr": "4x3",
                    "value": 12
                },
                {
                    "expr": "17+12",
                    "value": 29
                },
                {
                    "expr": "16-7",
                    "value": 9
                }
            ],
            "answer": "11-8=3; 15+19=34; 3x5=15; 12-6=6; 4x3=12; 17+12=29; 16-7=9",
            "question": "Match each expression with its answer: 11-8=?, 15+19=?, 3x5=?, 12-6=?, 4x3=?, 17+12=?, 16-7=?",
            "difficulty": "hard"
        },
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            "type": "math-match",
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                {
                    "expr": "13-9",
                    "value": 4
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                {
                    "expr": "16+7",
                    "value": 23
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                {
                    "expr": "17-4",
                    "value": 13
                },
                {
                    "expr": "14-3",
                    "value": 11
                },
                {
                    "expr": "9x6",
                    "value": 54
                },
                {
                    "expr": "9x5",
                    "value": 45
                },
                {
                    "expr": "3x5",
                    "value": 15
                }
            ],
            "answer": "13-9=4; 16+7=23; 17-4=13; 14-3=11; 9x6=54; 9x5=45; 3x5=15",
            "question": "Match each expression with its answer: 13-9=?, 16+7=?, 17-4=?, 14-3=?, 9x6=?, 9x5=?, 3x5=?",
            "difficulty": "hard"
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