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Curriculum › Math ›Grade 2

Grade 2 Math · Level 4, Arithmetic within 100

Subtraction Within 100

Subtract one- and two-digit numbers accurately and fluently, including regrouping.

Questions like

  • 72 − 48 = ?

How the lesson starts: Subtraction Within 100

  1. Nina's bakery

    Mmm, smell that! Baker Nina baked 58 cupcakes this morning. She sold 32 of them. How many are left? Let's subtract!

  2. Count up!

    One way: count up! What is 47 − 23? Think: 23 + what makes 47? Start at 23. Hop 20 to reach 43. Then hop 4 to reach 47. 20 + 4 = 24. So 47 − 23 = 24!

  3. Tens and ones

    Now 58 − 32. Break 32 into 30 and 2. Take away the tens: 50 − 30 = 20. Take away the ones: 8 − 2 = 6. Put them together: 20 + 6 = 26 left!