Diagnostic Snapshots for Addition and Subtraction Progressions

Subtraction snapshot / Progression / Addition
snapshot
2-3
CA / 5–2 5-? =1 / Up to Five (result and change unknown)
8–5 8-? =3 / With Five (result and change unknown)
7–4 7-? =3 / Across Five (result and change unknown)
10–4 10-? =7 / Making 10 (result and change unknown)
13–3 14-? =4 / Teen numbers (result & change unknown)
Place Value: Make 17 / Bundling Tens and Ones with Place Value Equipment, e.g. ‘make 17’:1 ten & 7 ones / Place Value: Make 17
4
AC / 67–4 77-? =73 / Counting on/back in ones
(result and change unknown)
74–20 74-? =54 / Add/Subtract Tens
(result and change unknown)
74–32 74-? =32 / Add/Subtract Tens and Ones - no renaming (result and change unknown)
5
EA / NA / Grouping using Compatible numbers, / 2+9+8+3+1 =
13 – 7 / Using Doubles or Near Doubles
92–8 73-?=67 / Add/Subtract Ones by splitting
(result and change unknown)
74–32 74-? =32 / Add/Subtract Tens and Ones no renaming (result and change unknown)
54–19 / Simple renaming, e.g. rounding
6
AA / 83 – 56 275 - 36 / Place Value (tens and ones)
73 – 19 , 615 - 299 / Compensation with tidy numbers
73 – 19, 615 - 299 / Equal Additions / Not applicable
73 – 59 732 - 689 / Reversibility/ Inverse Operations / Not applicable
91 - ? = 38 / Change and start unknown
Choosing efficiently from mixed methods including the written form (algorithm)
7
AM / 3.2 - 1.4 / Decimal tenths by place value
3.2 – 1.9 / Decimal tenths by tidy numbers
3.2 – 1.9 / Decimal tenths by equal additions / Not applicable
3.2 – 1.9 / Decimal tenths by reversibility / Not applicable
8.5 - ? = 6.9 / Decimal change and start unknown
14.5 - 2.6, / Choosing efficiently from mixed methods including the written form (algorithm)
3.4 – 1.89 / Decimal Hundredths (repeat as for tenths)
-7 - +3 / Integers
7/8 – 1/4 / Fractions with related denominators
AP / 7/9 – 1/5 / Fractions with unrelated denominators

1

Marie Hirst, Numeracy Facilitator, 2010