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 = ?

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

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 = ?

Rotate to landscape screen format on a mobile phone or small tablet to use the **Mathway** widget, a free math problem solver that **answers your questions with step-by-step explanations**.

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

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