Millimetres, perimeter, and how addition and subtraction are linked
Answers are for parents and teachers.
1
5 cm 3 mm = ? mm
53
2
2 dm 6 cm 2 mm + 3 dm 9 cm 6 mm = ? mm
658
3
A square has side 7 dm. What is its perimeter in dm?
28
4
Knowing 345 + 278 = 623, find 623 − 345.
278
5
(365 − 148) + (435 − 326) = ?
326