Page 22 - steps 4b 02.pdf
P. 22
RM28
II Subtraction II II II II II II II II 4b:q
Magic numbers
Rules
o Choose a 3-digit number. 467
o Reverse it. 764
o Find the difference. 164 -461::;:;.291
o Reverse the answer. 192
192+291=-1 89
o Add. 0
-IT] Complete this example.
o Choose a 3-digit number. 563
o Reverse it. .3 6 5
o Find the difference. 563 - 365 =
o Reverse the answer.
o Add.
[!] Start with other 3-digit numbers.
Find out what happens if you tryout more examples. -__ ,,,,,\&1\.
Trialling examples using addition and subtraction of
Name three-digit numbers.
Date Materials: calculator (optional)
© 1994 HarperCollins Publishers STEPS 4b
