2nd Grade Subtraction Function Tables Worksheet: Follow the Rule

Say a number to a seven-year-old, ask them to take away 9 in their head and call out the result, and you have a number machine. This 2nd grade subtraction function tables worksheet turns that game into six tables, labeled a to f. Each table has a subtraction rule at the top, such as subtract 12, subtract 50 or subtract 73, and a column of inputs. Your child writes the working, like 42 - 12, then the output. Every row is an input and output pair, and the results range from 0 to 93. Table d turns big inputs into tiny answers. A raccoon holding an apple sits in the corner. A second page gives the answer key.

Why one rule teaches many facts

A function table repeats one rule many times, so your child can focus on the pattern instead of reading new instructions on every line. That repetition is the beginning of algebraic thinking: the rule stays fixed, the inputs change.

The tables also reveal structure. In table f, the inputs 31, 41, 51 and 61 climb by ten, and so do the outputs, 2, 12, 22, 32. In table c, subtract 50 only changes the tens digit. Spotting those patterns turns two-digit subtraction from a chore into a puzzle.

The show working column keeps each step honest. If an output looks wrong, you can see whether your child misread the rule or slipped in the subtraction. Mistakes become easy to locate.

At the table: table d and the input 9

Start with table c. Ask what subtract 50 does to the tens, then let your child try 60 and 70.

Table d surprises children. Big inputs like 77 and 76 give tiny outputs, 4 and 3. Some think they made a mistake. Ask, "How far is 77 from 73?" Counting up four steps on fingers confirms it.

In table b, the input 9 with the rule subtract 9 gives zero, and some children leave the box empty. Point to it and ask which number means nothing. Also watch 20 - 9, where a child may write 29 by flipping the ones. Finally, ask your child to describe the pattern in table f in their own words.

Walks, buses and Simon Says

A subtraction machine works as well out loud as on paper. On a walk, start at 50 and have your child subtract 10 at every lamppost you pass together.

Also, Simon Says can carry a rule. Announce that Simon says take away 6, then call 12, 33 or 57 and let your child shout the output. Leave out Simon now and then to keep everyone alert.

When passengers step off a bus, ask how many remain. Once you finish the page, check the tables with the answer key. Then praise the patience: "You worked through all six rules without giving up."