In this lesson, we will learn how to write a family of addition and subtraction facts linking three numbers up to 20.
Students will be able to
Q1:
We know that 8 plus 7 is 15. Here are the four number sentences for 8, 7, and 15. 8+7=1515−7=87+8=1515−8=7
Here are some number sentences for 5, 6, and 11. 6+5=1111−5=65+6=11 Which number sentence for 5, 6, and 11, is missing?
Q2:
Which number sentence is wrong?
Q3:
16 plus 3 is 19. Which number sentence is missing from the number sentences 3+16=19,16+3=19,19−16=3?
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