A teacher-facing answer key and instructional guide for the "Dozen or Twenty" intervention materials.

Two pages of extra practice focusing on identifying, drawing, comparing, and writing the numbers 12 and 20 using base ten blocks and place value concepts.

A high-contrast visual comparison sheet showing the numbers 12 and 20 side-by-side with digits, word forms, and base ten block illustrations. Includes tracing practice at the bottom.

A set of 10 printable flashcards for first-grade students featuring word problems on subtracting multiples of ten. Designed for double-sided (duplex) printing with fronts on odd pages and mirrored backs on even pages. Each card includes a simple word problem and a matching equation.

A number 14 tracing worksheet featuring a large bubble number for coloring/tracing and 14 butterfly icons for counting practice.

A number 13 tracing worksheet featuring a large bubble number for coloring/tracing and 13 bee icons for counting practice.

A number 12 tracing worksheet with a large bubble number and 12 ladybug icons for counting activities.

A number 11 tracing worksheet with a large bubble number for tactile practice and 11 snail icons for counting.

A set of 15 double-sided flashcards featuring subtraction equations with multiples of ten, updated to a 0-99 range. Designed for easy double-sided printing with mirrored answer layouts.

A set of 12 printable double-sided flashcards for first-grade math comparison problems. Formatted with 6 cards per page and mirrored back-side layouts for perfect alignment when printing double-sided. Word problems use simple black text without formatting emphasis for a clean, non-distracting reading experience.

A set of 10 printable math flashcards redesigned for double-sided (duplex) printing, featuring missing-part subtraction problems within 20 for first-grade learners.

A complete set of 15 self-checking "Digit Detective" flashcards for numbers 0-99. Each card features a standard form number on the front and a single specific answer (word form, expanded form, or place value chart) on the back for self-study.

A set of 10 printable addition word problem flashcards using 1st grade sight words and decodable text. Designed for double-sided printing with problem fronts on page one and mirrored answer backs on page two.

A set of 10 printable word problem flashcards for 1st grade students focusing on missing addends within 20. The fronts feature simple decodable word problems with themed backgrounds, while the backs provide the answer, label, and full equation for self-checking.

A detective-themed visual presentation that introduces students to standard, word, and expanded forms of numbers. Includes clear examples and place value breakdowns.

A concise master answer key for all 15 Digit Detective flashcards, including word form, expanded form, and place value chart solutions.