Mixed Subtraction with Post Office — Grade 1

Because the rows vary, a child cannot switch off. A group of letters, stamps and a parcel minus a written number asks for the result; a group with the result shown asks for the missing part. Both are within twenty, and meeting them together builds the flexible subtraction sense Grade 1 is after — seeing that start, change, and result are linked and any one can be the blank. Because every amount is small and pictured, the child can always fall back on counting the post to confirm an answer.

A page that asks only one kind of question lets a child coast; a mixed page does not. Alternating result-unknown and missing-part rows keeps attention on the meaning of each problem, which is why mixed practice is valuable at Grade 1. The within-twenty range and pictured post keep the focus on thinking, not on big numbers.

Children who like post office enjoy not knowing which question is coming next, and it keeps a small group thinking. When this feels easy, try mixed subtraction with reptiles and amphibians, or mixed subtraction with tools. You can also browse every subtraction worksheet or the whole post collection for grade 1 — each sheet prints cleanly in black and white or plays online for free.