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About this Grade 1 2 Digit By 1 Digit Drill

At age 6 and 7, students are building the mental bridges between single-digit facts they've memorized and larger numbers they encounter in real life. Multiplying a 2-digit number by a single digit—like 12 × 3 or 24 × 2—teaches children that numbers can be broken apart and recombined, a foundational strategy for all future math. This skill develops number sense: kids begin to see 23 as "20 and 3" rather than just one blob of digits. When your child counts money, calculates how many crackers three friends need (if each gets 15), or figures out toy quantities, they're using these same mental processes. Mastering 2-digit-by-1-digit problems also strengthens working memory and builds confidence with multiplication before third grade, when these problems become faster and more complex.

What your student will practice

• Break apart 2-digit numbers into tens and ones for easier multiplication
• Multiply tens and ones separately, then recombine the products
• Apply repeated addition or skip-counting to solve 2-digit-by-1-digit problems
• Check answers using a different strategy or estimation

Common mistakes to watch for

Many first-graders forget to multiply the tens digit and only multiply the ones place—so 23 × 2 becomes 6 instead of 46. Others write down partial products in the wrong columns or lose track of their work when moving between tens and ones. You'll spot this when a child's answer is missing a zero or is drastically too small. Watch for students who rush and don't regroup correctly, or who multiply the same digit twice without moving to the next place value.