Subtract within 20 (no borrowing) - Ice

• Students will recall subtraction facts within 20 with increasing speed and accuracy.
• Students will apply strategies, including counting back, using ten frames, and using related addition facts, to derive unknown subtraction facts.
• Students will recognize fact families and use them to connect addition and subtraction relationships.

These subtraction facts worksheets for 1st grade build the automaticity and fluency that children need to move comfortably into 2nd grade math. Students practice subtraction facts within 20 through drills, fact families, ten frame activities, and missing number problems, developing both speed and a deep understanding of how subtraction works. Our subtraction worksheets for 1st grade go beyond simple memorization by including multiple problem formats that push students to think flexibly about number relationships. Mastering subtraction facts frees up working memory for the more complex math strategies ahead.

Use a fact family triangle to show your child that 5, 3, and 8 are related: 5 + 3 = 8, 3 + 5 = 8, 8 - 3 = 5, and 8 - 5 = 3. When students see subtraction as the reverse of addition, they can use the addition facts they already know to solve subtraction problems without starting from scratch. Alternate between timed practice (30 problems in 3 minutes builds fluency) and untimed, reflective work ("how did you figure that out?") to develop both speed and strategy.

1.OA.C.6 requires 1st graders to add and subtract within 20, demonstrating fluency for addition and subtraction within 10 and using strategies for problems involving larger numbers. Subtraction facts worksheets build the automaticity within 10 and the strategic thinking within 20 that this standard requires.