number work practice - addition and subtraction, hopefully without a calculator

the powerpoint is here

some tasks involve simple simultaneous equations (e.g. two numbers sum to 10 with a difference of 2, what are they?)

the numbers are the lengths of the squares rather than their area

sometimes you have to find the right lengths to compare e.g. in the 7, 5, 7 resource (two) below,

having found 12 (above the 7 + 5) then 12 + 5 = ? + 7

find the missing numbers

a 'perfectly squared' rectangle has all the squares of different sizes

an 'imperfectly squared' rectangle

what are the missing lengths?

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