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Black writing on yellow card with white flips, A great source for counting and ordering numbers from 1 to 20 On one side numbers 1 to 10 are displayed and on the other 11 to 20 Use the blanks to highlight patterns, or challenge your pupils to try to determine the missing numerals, A great source for counting and ordering numbers from 1 to 20. On one side numbers 1 to 10 are displayed and on the other 11 to 20. Use the blanks to highlight patterns, or challenge your pupils to try to determine the missing numerals.