Tool Tips

• Blue blocks are positive.
• Red blocks are negative.
• Drag and drop blocks or use add buttons to add blocks for each field.
• Switch between positive and negative integers by clicking on this button above each field:
  ->0 First Integer
• A positive block and a negative block cancel each other out:
+
= 0
• Cross out blocks by clicking on them
• Check your answer by entering a total at the bottom