Work with addition and subtraction equations
Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = ＿ – 3, 6 + 6 = ＿.
Related Lessons
Lesson 208
Warm up with a Mystery Math Mistake to find the error in DC's addition. Use different strategies to subtract including counting back and the connection between addition and subtraction. Use a number line to help count on to find a difference.
Lesson 203
Represent 10 using a number bond and 10-frame with a missing addend. Use Notice and Wonder with a 10-frame, connecting [...]
Lesson 308
Join Mrs. Markavich for a missing addend word problem with Professor Barble. Next, we are going to look closely at addition problems to see when we make a new ten or when we don't. You will be an expert and looking carefully at addition problems!
Lesson 309
Join Mrs. Markavich for a missing addend word problem with Professor Barble! Look out for two of our Math Might friends D.C. and Value Pak as they help us learn to add two-digit number in more than one way!
Lesson 310
Join Mrs. Markavich for a missing addend word problem with Professor Barble! Next we are going to spend some quality time with Value Pak as we learn to add by adding tens-and-tens then ones-and-ones!
