# Step 2

Difficulty 2

 1 Changing numbers: Addition/subtraction using negative integers 2 Changing numbers: Addition/subtraction using negative integers 3 Changing numbers: Addition/subtraction using negative integers 4 Changing numbers: Addition/subtraction using negative integers 5 Make 20 13+-6+* 6 Make 15 3+19+* 7 Make 10 8+7+* 8 Make 20 8+-2+* 9 Make 15 21+-6+* 10 T/F double sided eqn incl -ive # 11 T/F double sided eqn incl -ive # 12 Add these three numbers: 13+-7+3 13 Add these three numbers: 9+2+-3 14 Add these three numbers: 9+8+-5 15 Add these three numbers: 16+-9+2 16 Add these three numbers: 20+-9+11 17 Number detectives: Add 4 clustered hundreds numbers 18 Number detectives: Add 4 clustered hundreds numbers 19 Number detectives: Add 4 clustered hundreds numbers 20 Number detectives: Add 4 clustered hundreds numbers 21 Number detectives: Add 4 clustered hundreds numbers 22 Adding the big ones: Write missing numbers in vertical addition 23 Adding the big ones: Write missing numbers in vertical addition 24 Adding the big ones: Write missing numbers in vertical addition 25 In the swim: Addition of times 26 And a Partridge in a pear tree 12+11+10+9, etc 27 Taking the Big Ones: Write the missing numbers in vertical subtraction algorithms 28 Taking the Big Ones: Write the missing numbers in vertical subtraction algorithms 29 Taking the Big Ones: Write the missing numbers in vertical subtraction algorithms 30 True or false 60 - 120 = -60 31 True or false 420 - (-85) =515 32 True or false 120 - 250 = -130 33 Same or different: Click all the boxes with the same answer 34 Same or different: Click all the boxes with the same answer 35 Same or different: Click all the boxes with the same answer 36 Same or different: Click all the boxes with the same answer 37 Give or take a thousand: 257908 - 160000 38 Give or take a thousand: 135001 - 34000 39 Give or take a thousand: 106095 - 29000 40 Give or take a thousand: 236401 - 195401 41 Give or take a thousand: 182356 - 127356 42 Give or take a thousand: 262141 - 245141 43 Give or take a thousand: 120068 - 88068 44 Give or take a thousand: 86215 - 7000 45 Give or take a thousand: 13553 - 8000 46 Give or take a thousand: 842908 - 74000 47 Taking the Big Ones: Write the missing numbers in vertical subtraction algorithms 48 Taking the Big Ones: Write the missing numbers in vertical subtraction algorithms 49 Spot the difference: 4550 - 2150 50 Spot the difference: 6600 - 3650 51 Spot the difference: 5750 - 2550 52 Spot the difference: 9350 - 5450 53 Spot the difference: 2600 - 8700 54 Spot the difference: 8400 - 3500 55 Spot the difference: 3150 - 1500 56 Negatively speaking: -2 +(-4) - * = 10 57 Negatively speaking: - 4 + 5 - * = 10 58 Negatively speaking: -8 +7 - * = 10 59 Negatively speaking: -6 - 1 - * = 10 60 Negatively speaking: -16 +25 - * = 10