Page 19 - steps 3b.pdf

20
baseboard,
• More exchanging . • • • • • • Checking subtraction . base 10 materials
~:t.I.]}IEl.~
PAGE 28 [JJ Decide the best way to find the answers. n Bill's dad had 40 beakers
l1li in his cafe.
a 343 - 171 b 253 - 182 c 156 - 72
d 409 e 327 156
-236 - 273 ::.Jill

0 Subtract 163 from each of these.
a 234 b 258 c 306 d 415 e 327 f 409
[I] Find the two subtractions
that each have a mistake.
Write them correctly.
a 405 b 346 c 274
- 72 - 64 -167
333 382 107
d 425 e 2~0 f 341
- 372 - 47 -277
53 243 164
[JJ Do these subtractions and then check by adding .
a 268 - 137 b 356 - 143 c 480 - 34
d 379 - 106 e 176 - 25 f 499 - 333
o Make up four subtractions of your own. Then check by adding.

[I] Write and illustrate a story like the one shown above.
Use these numbers: 25 15 10
m !STEPS 3b:11! I STEPS 3b:1 1 1 aD

OJ 00 ~ OJ 00

a 172 a 71 b 364 - 64 = 282 a 268 - 1 37 = 1 31 b 356 - 143 = 213 Open: making up four
131 + 137 = 268 21 3 + 143 = 356 subtractions and
b 71 b q5 f 34 1 - 277 = 64
checking by addition.
c 480 - 34 = 446 d 37q - 1 06 = 273
c 84 c 143
Challenge 446 + 34 = 480 273 + 106 = 37q
d 173 d 252 ~
326 - ql = 235 e 176 - 25 = 151 f 4qq - 333 = 166
e 54 e 164 151 + 25 = 176 166 + 333 = 4qq Open: writing and
447 - 172 = 275 illustrating a similar
f 76 f 246
@- lq4,= 265 story using numbers
25,15,10. (1/3 b)