Length: 0:38The Missing SideA rectangle has a perimeter of 30 cm and is 9 cm long. How wide is it?Grade 4Learning video 82 · Geometry
Opposite Faces of a Dice
Watch and solve along: the video pauses when the question comes. Type your answer, then watch the solution.
Read the story
Take a close look at a dice.
The dots on opposite faces always add up to 7.
The 1 is on top, so the 6 is on the bottom. Because 1 plus 6 is 7.
The 2 is in front, the 5 is at the back. 2 plus 5 is 7 too.
The 3 is on top. Which number is on the bottom?
Answer and working
Correct! 3 plus 4 is 7. The 4 is on the bottom.
7 − 3 = 4
Geometry
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