Videos, worksheets, games and activities to help students learn adding and subtracting multiples of 10 in Singapore Math.

Singapore Math (Grade 1B, Unit 18): Adding a Multiple of 10 to a Two-Digit Number

How to add a two-digit number and a multiple of 10, using concrete models and strategies based on place value.

Uses number discs to show how to act out the following problems:

42 + 40 = ?

50 + 36 = ?
Addition Using Place Value Discs

Singapore Math (Grade 1, Unit 18): Subtract a Multiple of 10 from a Two-Digit Number

How to subtract a multiple of 10 from a two-digit number, using concrete models and strategies based on place value.

Uses number discs to show scholars how to act out the following problems:

54 - 20 = ?

78 - 30 = ?

Singapore Math (Grade 1B, Unit 18): Adding a Multiple of 10 to a Two-Digit Number

How to add a two-digit number and a multiple of 10, using concrete models and strategies based on place value.

Uses number discs to show how to act out the following problems:

42 + 40 = ?

50 + 36 = ?

How to subtract a multiple of 10 from a two-digit number, using concrete models and strategies based on place value.

Uses number discs to show scholars how to act out the following problems:

54 - 20 = ?

78 - 30 = ?

Try the free Mathway calculator and
problem solver below to practice various math topics. Try the given examples, or type in your own
problem and check your answer with the step-by-step explanations.

We welcome your feedback, comments and questions about this site or page. Please submit your feedback or enquiries via our Feedback page.