 # Adding and Subtracting Multiples of 10

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 = ?

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 = ?

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