Adding and Subtracting Base Tens

What is the sum of 78 and 45 using the base 10 strategy?

• 123

• 113

• 133

• 103

Using the decompose & compose strategy, what is the result of adding 34 and 29?

• 53

• 63

• 73

• 83

Which of the following is a step in the base 10 strategy?

• Ignoring place value

• Breaking numbers into tens and ones

• Subtracting instead of adding

• Using a calculator

When we break a number into smaller parts, we are using the __ strategy.

Answer explanation

When we break a number into smaller parts, we are using the 'decompose' strategy. This method helps in understanding and simplifying numbers by separating them into manageable components.

• 1 Ten  
  4 Ones
• 1 Ten
  8 Ones
• 4 Tens
  1 One
• 3 Tens
  4 Ones

• 2 Tens 
  5 Ones
• 2 Tens
  0 Ones
• 2 Tens
  3 Ones
• 3 Tens
  2 Ones

• 4 Tens 
  4 Ones
• 4 Tens
  2 Ones
• 2 Tens
  2 ones
• 2 Tens
  4 Ones

• 1 Ten
  6 Ones
• 1 Ten
  3 Ones
• 6 Tens
  1 One
• 3 Tens
  4 Ones

• 3 Ten
  3 Ones
• 0 Ten
  5 Ones
• 3 Tens
  5 Ones
• 5 Tens
  3 Ones

• 3 Tens
  1 One
• 0 Tens
  3 Ones
• 3 Tens
  3 Ones
• 4 Tens
  3 Ones