Teachers, save “LI: Subtraction across a decade (45 - 7)” to assign it to your class.

Work through each Prove It question. You can Practise solving each one in your book and take a photo of your work and add it to the slide. Remember to use the steps you have been learning during your Learn Its. Use the to record how you worked out each equation. Tell us what happened first, next.. Tap the to add to your journal.