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Support number sequencing and early place value with this ocean-themed count to 20 missing number worksheet. Perfect for learners in EYFS, KS1, and Pre-K to 1st Grade, this activity helps children practise number recognition, ordering, and counting skills by filling in the missing numbers in a sequence.

Each row features a number line to 20 with some numbers left blank. Children use their understanding of counting and patterns to complete the sequences.

Ideal for:

Maths lessons or warm-ups
Morning work and early finishers
Maths centres or stations
Intervention and SEN support
Ocean or summer-themed topic units
Learning Objectives Covered:

UK Curriculum (EYFS/KS1):

ELG: Number – Verbally count beyond 20, recognising the pattern of the counting system
Count forwards and backwards within 20
Identify and order numbers to 20
US Common Core (Pre-K–Grade 1):

K.CC.A.1 – Count to 20 by ones
K.CC.A.2 – Count forward beginning from a given number
K.CC.A.3 – Write numbers from 0 to 20 and represent a number of objects with a written numeral
A no-prep worksheet that supports number fluency and sequencing while fitting seamlessly into an ocean-themed unit.