Sample mistakes
- 16 + 1 = 61 The pupil has misread this as 60 + 1
- 16 + 1 = 62 The pupil has misread this as 61 + 1
- 16 + 1 = 70 The pupil has read this correctly but has miswritten 17 as 70
- 60 + 1 = 17 The pupil has misread this as 16 + 1
- 60 + 1 = 71 The pupil has misread this as 16 + 1 and has miswritten 17
- 60 + 1 = 70 The pupil has misread this as 16 + 1 and has miswritten 17
- 13 + 1 = 16 The pupil has misread this as 15 + 1
- 13 + 1 = 60 The pupil has misread this as 15 + 1 and has miswritten 16
- 13 + 1 = 61 The pupil has misread this as 15 + 1 and has miswritten 16
- 12 + 1 = 21 The pupil has misread this as 20 + 1
- 12 + 1 = 15 The pupil has read this correctly but has miswritten 13 as 15
- 12 + 1 = 51 The pupil has read this correctly but has miswritten 13 as 51
- 12 + 1 = 50 The pupil has read this correctly but has miswritten 13 as 50
These are just a few examples, but give an idea of the type of mistakes that indicate a difficulty with ‘teen’ and ‘ty’ numbers.