Challenge 1
Solve these addition and subtraction problems.
1) 424 + 352 =
2) 623 – 42 =
3) 824 + 904 =
4) 983 + 179 =
5) 793 = 926 –
6) 1108 = 368 +
7) 352 + ______ = 827 – 193
Explain how you solved this question.
Challenge 2
Solve these addition and subtraction problems.
1) 2831 + 163 =
2) 3718 + 5929 =
3) 7103 – 842 =
4) 9833 – 1279 =
5) 3523 = 9026 –
6) 11038 = 3638 +
7) 2842 + ______ = 6493 – 2356
Explain how you solved this question.
Challenge 3
Solve these addition and subtraction problems.
1) 42 831 + 18 203 =
2) 2831 + 30 352 =
3) 3793 = 9326 –
4) 11 038 = 3648 +
Fill in the gaps in these questions:
5)
6)
3
4
1
4
–
2
9
8
2
6
2
+
4
0
5
9
1
2
5
1
8
0
7) Bruce was asked to solve the following question. Explain what is wrong with this column addition
calculation.
a) 362 + 1239
+
1
3
2
5
6
3
9
2
9
11
Answer = 5911
Answers
Challenge 1
1)
2)
3)
4)
5)
6)
7)
776
581
1728
1162
133
740
282
Challenge 2
1)
2)
3)
4)
5)
6)
7)
2994
9647
6261
8554
5503
7400
1295
Challenge 3
1)
2)
3)
4)
5)
6)
7)
61 034
33 183
5533
7390
34 716 - 5482 = 29 234
64 029 + 5151 = 69 180
Bruce did not carry over the 10 from 11 into the tens column. Answer is 1601.