Secret Code Addition with Dinosaurs — Grade 1

This Grade 1 worksheet hides numbers inside pictures. The legend reveals what each of the dinosaurs is worth, and the child decodes each row and adds the three or more values together. It pairs substitution with multi-number addition — the step past kindergarten's two-addend sums — and the code-breaking gives every row a small payoff. Keeping the totals within twenty means the decoded sums are still countable and checkable.

The substitution step quietly strengthens number sense: a child has to hold what each picture is worth while adding, which is more demanding than reading bare numerals. That is good Grade 1 work, and pairing it with three-or-more-addend sums within twenty builds the comfort with combining several numbers that Grade 1 is meant to develop — without ever leaving the range a child can count to be sure.

Children who like dinosaurs treat each row as a small puzzle, which keeps a code-breaker happily adding. When this feels easy, crack the code in secret code addition with faces (black & white), or try secret code addition with insects and bugs. You can also browse every secret code addition worksheet or the whole dinosaurs collection for grade 1 — each sheet prints cleanly or plays online for free.