Addition Strategies
Estimate the sum
3007 + 5015
Around 8000
157+722=
879
193-32=
161
Estimate the difference
870 - 359
Around 500
7109 written in expanded form
7000+ 100 + 9
Solve this using the right to left strategy
2580 + 3000
5580
632 + 661
1,293
645-237=
208
Solve using mental math
850 - 350 =
500
The value of the digit in the thousands place: 16,345
6 000
Solve this using the left to right strategy
1300 + 2689
3989
5,647+854 =
6,501
1 500-378
1 122
Solve using the renaming strategy
2000 - 1342
658
The value of the digit in the hundreds place: 53,636
600
Estimate the sum 5998 + 3899
3 965 + 1 357 =
5 322
9,000-5,637=
3,363
9000 - 5 578
4 422
5,643 rounded to the nearest hundred
5,600
Solve this using the right to left strategy
4594 + 6197
10 791
12,789 + 65,382 =
78,171
18,000- 4,678=
13,322
Estimate the difference
9850 - 2795
About 7 000
17,943 rounded to the nearest ten-thousand
20,000