you are taking the following test:

Grade: 1,    Subject: Math,    Topic: Ordering Numbers
 Question 1: Which series is in correct increasing order? 13, 16, 19, 17 14, 18, 16, 12 15, 17, 19, 21 12, 14, 12, 15 13, 16, 19, 17 14, 18, 16, 12 15, 17, 19, 21 12, 14, 12, 15
 Question 2: Which series is in correct increasing order? 23, 16, 33, 17 24, 18, 26, 12 35, 37, 45, 47 22, 14, 12, 15 23, 16, 33, 17 35, 37, 45, 47 24, 18, 26, 12 22, 14, 12, 15
 Question 3: Which series is in correct increasing order? 22, 11, 33, 44 21, 31, 41, 51 55, 22, 33, 44 9, 19, 39, 29 22, 11, 33, 44 21, 31, 41, 51 55, 22, 33, 44 9, 19, 39, 29
 Question 4: Which series is in correct increasing order? 7, 15, 27, 10 19, 9, 41, 33 12, 22, 33, 13 9, 16, 36, 49 7, 15, 27, 10 19, 9, 41, 33 12, 22, 33, 13 9, 16, 36, 49
 Question 5: What is the missing number in this series? 8, 9, ?, 11, 12 5 10 15 20
 Question 6: What is the missing number in this series? 17, 18, ?, 20, 21 14 15 19 22
 Question 7: What can be the missing number in this series? 20, 22, ?, 26, 28 18 4 2 24
 Question 8: What can be the missing number in this series? 15, 16, ?, 18, 19 17 19 30 40
 Question 9: What can be the missing number in this series? 8, 18, ?, 38, 48 17 28 16 49
 Question 10: What can be the missing number in this series? 20, 25, ?, 35, 40 22 24 30 31
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