Page 34 - Y5.pdf

See Pupil's Book page 66

Subtraction out! Addition in!

------ ------ ------- -------- ------ ------ -------
~-----

a Add each pair of black and white numbers.
b Do they always add up to zero?
c The white number is the INVERSE of the black.

+2+-1 = +1 which is the same
Moral : subtracting a number gives the same answer as adding its inverse.

2 Cut out and fold the pairs of numbers along the line where the black and white halves
join.
Use them to work out these subtractions.

a ,---------, f r-------- ~ k r--------,
+ +1: -1l +1! -51_+41_
I- ·-
i
2 I- I- I ,- I 1-
1
I
i-------
i
L ________ .J
I
' : : ---- -- : : ------
I
'
L--------.J
~-------J
b : l: g r--------~ I ~--------,
,...--------,
+3 I- ,_ -2i--2!· +5: -jl!
I
I
-
I
I
I
I
!-_____ _
:- .. :=
i
I L _______ .J I : ! ------ : i ------
' ... ____________ .J
I
I
' '--- _______ _J
c h ,-----------, m
+ 2 r---+-2----1 - : +3: + 2 r---+-3-----1
I I
I I
'
:- :== 3 :- :== ·- i=
: : ------ ! i ------ : ! -------
.
' I ' ' L----------.J
I
L---------.J
1 -31
d L---------.J r----------, n r----------1
r----------,
+51--21== -21--31== + :- !=
I
I
l ------ 2
I
I
: ! ------ ! : ! -------
1 I ' I ' I
L-----------J
e L---------.J . L----------.J p : +a:
-----·-------.
r--- -------,
J
+ 4 r--=-3-----1 := -6!-+2!= _____ _ I :- I I==
,_
-
: i ------ 2 i l -------
L----------.J I I .._ ___________ J I ' L----------J I
'
32