Estimation: Subtracting
Round to the nearest 10
39 - 22 =
40 - 20= 20
Using estimation to the nearest 10: 46 + 72 =
50 + 70 = 120
Round to the nearest 10
63
60
26 + 38 =
30+40 = 70
Round to the nearest 10
51 - 26 =
50-30=20
Using estimation to the nearest hundred: 24 + 49 =
20 + 50 = 70
Round to the nearest 10
346
340
97 + 25 =
100+30=130
Round to the nearest 10
81 - 48 =
80 - 50 = 30
Round 864 to the nearest hundred.
900
Using estimation to the nearest hundred: 120 + 287=
100 + 300 = 400
Round to the nearest 10
782
780
148 + 41 =
150+40=190
Round to the nearest 10
71 - 26 =
70-30=40
Round 743 to the nearest 100.
700
Using estimation to the nearest hundred: 423 + 513 =
400 + 500 = 900
Round to the nearest 100
293
300
Round to the nearest 10
138 + 129 =
140+130= 270
Round to the nearest 100
164 - 131 =
200-100= 100
Steven has 555 marbles in his collection. When asked how many he has to the nearest hundred, he should say:__________
600
Using estimation to the nearest hundred: 174 + 425
200 + 400 = 600
Round to the nearest 100
2,452
2,500
Round to the nearest 100
202 + 345
200 +300 = 500